How To Find the Stem of Any Latin Adjective

Do adjective stems confuse you? Then read this helpful guide on how to find the stem of any Latin adjective!

Adjective stems are important. You need to know an adjective’s stem in order to be able to decline it. Plus knowing the stem helps you to recognize the adjective when you see it in the wild (i.e. in a Latin text).

This post will discuss each different kind of adjective and walk you through exactly how to find its stem. We will cover 1st and 2nd declension adjectives (aka 2-1-2 adjectives) as well as all the various types of 3rd declension adjectives.

If you are a beginning student, some of the later sections may not be relevant to you. So just read as far as makes sense for you.

By the end of this post, you should feel much more confident about identifying Latin adjective stems. There will even be exercises for you to test yourself!

What is an adjective stem?

Before we get ahead of ourselves, let’s talk about what a stem even is. I define a stem as the unchanging part of the adjective to which case endings are added. Some people call this the base, so it depends on what textbook you are using.

The important thing is that the stem/base is what you need to know to decline and recognize adjectives successfully.

You also need the stem to be able to create comparative adjectives and superlative adjectives.

The stem shows up in almost all case forms of the adjective. This is why it is so important! The main exceptions are certain nominative singular forms. We will talk about this more below.

How To Find the Stem of Any Latin Adjective

If you are familiar with the process of identifying noun stems, then you know you find a noun’s stem by removing the case ending from the genitive singular. In theory, you can use this method to determine adjective stems, too.

I say “in theory”, because in practice this will be hard. Why? Because Latin adjectives are listed in dictionaries and textbooks in a different way than Latin nouns are.

The dictionary entry for a Latin noun will include the nominative and the genitive singular, but the dictionary entry for most Latin adjectives will not. Instead, you will be given the nominative singular of the masculine, feminine, and neuter.

👉 Wondering why adjectives have three genders? Pause here to read my guide to Latin adjectives.

Instead of taking the ending off the genitive singular, then, the best way to find the stem of a Latin adjective is generally to remove the ending from the feminine or neuter nominative singular. Sometimes you can simply remove the ending from the masculine nominative singular, too!

The specifics depend on which declension and subtype the adjective belongs to. So without further ado, let’s get into the nitty gritty details.

1st and 2nd Declension (2-1-2) Latin Adjective Stems

There are two kinds of 1st and 2nd declension (or 2-1-2) adjectives. The most common has the masculine nominative singular in –us, but there are also adjectives with the masculine nominative singular in –er.

A good Latin dictionary will present 1st and 2nd declension adjectives as follows. The first example is an –us adjective, the second is an –er adjective.

Example #1: bonus, bona, bonum – good (NOTE: usually abbreviated to bonus, a, um)

Example #2: ruber, rubra, rubrum – red

The first form is the masculine nominative singular, the second is the feminine nominative singular, and the third is the neuter nominative singular.

To find the adjective’s stem, the most reliable thing to do is remove the –a from the feminine nominative singular. This always works, no matter what.

Example #1: bona – a = bon-

Example #2: rubra – a = rubr-

And there you go. Easy. If you are wondering why I told you to take the –a off the feminine, and not the –us off the masculine, this is because sometimes the masculine nominative singular does not include the stem.

Take ruber, rubra, rubrum. We have just seen that this adjective’s stem is rubr-, and yet rubr– is not present in the masculine nominative singular, ruber.

What if the adjective is abbreviated?

Dictionaries like to be concise, though, so they will abbreviate the feminine and neuter forms whenever possible. In fact, –us adjectives virtually always are given in shortened form. An abbreviated entry looks like this:

bonus, a, um – good

If you see this kind of presentation, you can assume that the masculine nominative singular includes the stem. Simply remove -us.

bonus – us = bon-

This gives us the same result as when we removed –a from bona up above.

With a word like ruber, rubra, rubrum, where the stem is not in the masculine nominative singular, you will never see a fully abbreviated form. You might see something like this:

ruber, bra, brum – red

The feminine form is abbreviated, but it still shows you that the e in ruber is not part of the stem. When you remove –a from –bra, you end up with –br-. This tells you that ruber‘s stem ends in –br-, not –ber-.

Time to practice! In the following exercise, use this method to find the stems of all these Latin adjectives.

This method also works for possessive adjectives like meus, a, um, since all possessive adjectives belong to the 1st and 2nd declension.

3rd Declension Latin Adjective Stems

There are various kinds of 3rd declension adjectives in Latin. We will go through each type one by one.

Two-Termination Adjectives (fortis, e)

Two-termination adjectives are the most common type of 3rd declension adjective.

This terminology may sound scary, but all it really means is that these adjectives have two possible nominative singular forms. One is masculine and feminine, and the second is neuter.

A dictionary entry for such adjectives looks like this:

Example #1: fortis, e – strong, brave

Example #2: dēbilis, e – weak

Fortis is the masculine/feminine nominative singular. –e is an abbreviation for forte, the neuter nominative singular. In the case of dēbilis, –e is short for dēbile.

For two-termination adjectives, you can simply remove the –is from the masculine/feminine nominative singular to find the stem.

Example #1: fortis – is = fort-

Example #2: dēbilis – is = dēbil-

This works because the masculine/feminine nominative singular always includes the stem.

To get the full form of the neuter nominative singular (abbreviated –e), simply find the adjective’s stem and then add –e to it.

Three-Termination Adjectives (ācer, ācris, ācre)

Three-termination 3rd declension adjectives are very similar to two-termination ones. The difference is that there is a distinct masculine nominative singular that is different from the feminine nominative singular.

Consequently, there are three nominative singular endings.

A dictionary entry looks like this:

Example #1: ācer, ācris, ācre – sharp, bitter

Example #2: pedester, pedestris, pedestre – on foot, pedestrian

The first form is the masculine nominative singular, the second is the feminine nominative singular, and the third is the neuter nominative singular.

To find the stem of three-termination 3rd declension adjectives, remove the –is from the feminine.

Example #1: ācris – is = ācr-

Example #2: pedestris – is = pedestr-

You have to take the ending off the feminine, because the masculine often does not include the stem.

One-Termination Adjectives (ingēns, ingentis)

One-termination 3rd declension adjectives only have one nominative singular form. The same form serves for the masculine, feminine, and neuter.

Because of this, dictionaries and textbooks also supply the genitive singular of one-termination adjectives. This is so you can determine the stem, which is not included in the nominative.

Here are some model dictionary entries.

Example #1: ingēns, ingentis – huge, enormous

Example #2: fēlīx, fēlīcis – happy, fortunate

The first form is the nominative singular masculine/feminine/neuter. The second form is the genitive singular masculine/feminine/neuter.

To find the stem, simply remove the –is from the genitive singular. This is the same way that you find the stem of a Latin noun.

Example #1: ingentis – is = ingent-

Example #2: fēlīcis – is = fēlīc-

And that’s all there is to it. Now you can find the stem of any Latin adjective.

Test your new knowledge on these 3rd declension adjectives!

Final Thoughts on Latin Adjective Stems

The key to identifying a Latin adjective’s stem is to figure out what kind of adjective it is. Is it a 1st and 2nd declension (2-1-2) adjective? Is it a 3rd declension adjective, and if so, is it one-termination, two-termination, or three-termination?

Always look at the adjective’s dictionary form and then follow the instructions outlined above. You will soon get used to the process. Seriously, if you keep trying, one day you will be identifying adjective stems effortlessly!

Constantly referring to a dictionary takes time, so I recommend that you memorize the relevant adjective forms when you learn new vocabulary. The easiest way to do this is to list the forms on your Latin flashcards.

This way, when you review your flashcards, you won’t just be learning word meanings. You will also be training yourself to recognize adjective types and stems.

And now, to conclude this post, here is one last exercise. This exercise includes all kinds of adjectives, so pay close attention!

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