Table of Contents

1. What Are Adjectives?
2. First and Second Declension Adjectives
   • Irregular Adjectives
3. Third Declension Adjectives
   • Terminations of 3rd Declension Adjectives

What Are Adjectives?

Adjectives are a part of speech that describe nouns and other parts of speech that can take the place of nouns (pronouns or substantives). Adjectives name some sort of attribute of the noun whether it is a quality, quantity or extent, or specific distinction from something else. Many languages, like English, rely on word order to show readers and speakers what word an adjective is describing, but since Latin is an inflected language, word order matters little when it comes to modifying words. Instead, readers must rely on the grammar and endings.

Just like Latin nouns, which have case (nominative, genitive, dative, accusative, ablative, vocative), number (singular or plural), and gender (masculine, feminine, neuter), a Latin adjective must match the noun it describes in these three qualities.

Latin adjectives fall into two categories:

1st & 2nd Declension Adjectives.

1st and 2nd declension adjectives are what most students begin learning when it comes to adjectives in Latin. 1st and 2nd declension adjectives, as the name implies, grammatically belong to the 1st and 2nd declensions of Latin. That means that when we decline them (change the ending so that it is in the correct grammatical case), these adjectives will take 1st and 2nd declension endings. In the dictionary, these words are usually given 3 forms, such as longus, -a, -um or longus, longa, longum.

This word – the word for “long” in Latin, is a 1st and 2nd declension adjective. These adjectives take 1st declension endings when the grammatical gender is feminine, 2nd declension endings when the gender is masculine, and 2nd declension neuter endings when the gender is neuter.

Take the sentence below for example.

Titus magnus puer erat.

Titus was a large boy.

In this example, the word magnus (large) is describing the word puer (boy). Both are nominative, masculine, and singular, so magnus must be describing the boy. Note that the endings do not have to be the same. While many students begin learning Latin with 1st or 2nd declension words, many fall into the trap of believing that modifiers of nouns must look alike. This is not the case. While this can get you by in Latin I and maybe Latin II, it will hinder you when it comes to reading more complex Latin texts. Focus on matching the case, number, and gender.

Puella in parvо̄ agrо̄ habitat.

The girl lives on a small farm.

	1st (Fem.)	2nd (Masc.)	2nd (Neuter)
Nom	a	us	um
Gen	ae	ī	ī
Dat	ae	о̄	о̄
Acc	am	um	um
Abl	ā	о̄	о̄
Nom Pl.	ae	ī	a
Gen Pl.	arum	о̄rum	о̄rum
Dat Pl.	īs	īs	īs
Acc Pl.	ās	о̄s	a
Abl Pl.	īs	īs	īs

There are 9 irregular adjectives that decline a little differently:

unus, –a, –um – one
totus, –a, –um – all, whole
nullus, –a, –um – no, none
solus, –a, –um – alone, only
ullus, –a, –um – any
alter, altera, alterum – the other (of two things)
neuter, neutra, neutrum – neither (of two things)
uter, utra, utrum – which (of two things)
alius, alia, aliud – the other [genitive singular sometimes alterius]

*These irregular adjectives follow the same pattern as the pronouns ipse, ipsa, ipsum; ille, illa, illud; iste, ista, istud

In these adjectives,

• genitive singular form is “‘”-ius”
• the dative singular form is “-i” for all genders.

For example:

unus, -a, -um

	1st (Fem.)	2nd (Masc.)	2nd (Neuter)
Nom	una	unus	unum
Gen	unius	unius	unius
Dat	uni	uni	uni
Acc	unam	unum	unum
Abl	unā	unо̄	unо̄
			
Nom Pl.	unae	unī	una
Gen Pl.	unarum	ununо̄rum	unо̄rum
Dat Pl.	unīs	unīs	unīs
Acc Pl.	unās	unо̄s	una
Abl Pl.	unīs	unīs	unīs

3rd Declension Adjectives

3rd declension adjectives have the same endings as 3rd declension nouns, but they follow the rules for i-stem 3rd declension words. That means the adjectives have

• “-i” fo the ablative singular
• “-ium” for th genitive plural
• “-ia” for the nominative, vocative, and accusative neuter plural

In these adjectives, the masculine and feminine forms are generally the same while the neuter form is different. You can tell the difference by looking at the forms of the dictionary definition.

Three termination 3rd declension adjectives

acer, acris, acre – sharp, keen

These adjectives have different forms for the masculine, feminine, and neuter genders in the nominative singular case (and accusative singular for neuter) but will take the same 3rd declension endings and look the same otherwise.

Two termination 3rd declension adjectives

omnis, omnis, omne – all

These adjectives have the same form for the masculine and feminine genders in the nominative singular and a slightly different form for the neuter.

One termination 3rd declension adjectives

ferox, ferocis – savage, wild

These adjectives have one form for all three genders. Note that the neuter endings are slightly different in the 3rd declension, so there is still some way to differentiate the neuter from the other two in some cases, but otherwise they will look alike. In the dictionary definition, the forms given do not indicate the genders but the nominative singular and genitive singular forms like with nouns.

As mentioned in the previous section, adjectives do not need to match in form in order to describe a noun. They only need to match in case, number, and gender. All below are examples in the nominative singular.

ferox vir – the ferocious man

acris puella – the (mentally) sharp girl

sapiens senex – the wise old man

	3rd (Masc./Fem.)	3rd (Neuter)
Nom	—	—
Gen	is	is
Dat	ī	ī
Acc	em	—
Abl	ī	ī
Nom Pl.	ēs	ia
Gen Pl.	ium	ium
Dat Pl.	ībus	ībus
Acc. Pl.	ēs	a
Abl Pl.	ībus	ībus

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