Adjectives Grammar Index Page

Adjectives in General

What is an Adjective?

In all languages, an adjective modifies or describes a noun or pronoun. In Latin any adjective must agree with the noun or pronoun it modifies in case, number and gender. Just as a noun never leaves its declension (puella, puellae, f. is always 1st declension and must therefore use first declension endings) so too an adjective stays in its declension family.

Before moving forward let's review the words case, number and gender. The last is easy: a noun is masculine, feminine or neuter with a few exceptions that can be either masculine or feminine such as canis. Number refers to whether a noun is singular or plural and case refers to nominative, genitive, dative, accusative or ablative.

Some adjectives belong to the first and second declension families. The second declension is used to modify nouns that are masculine or neuter and the first for feminine nouns. Some belong to the third declension family.

iratus, -a, -um
angry
laetus, -a, -um
happy
stultus, -a, -um
stupid
prudens, prudentis
wise, sensible
pinguis, pingue
fat
nobilis, nobile
noble
facilis, facile
easy
pulcher, pulchra, pulchrum
beautiful
celer, celeris, celere
swift
acer, acris, acre
keen, sharp
magnus, -a, -um
large, great
bonus, -a, -um
good

Adjectives never leave their declension family while they are positive degree adjectives. Sometimes an adjective may agree in declension too if the two words belong to the same declension. Thus, you can see such combinations as:

1st/2nd declension adjective with 1st, 2nd, 3rd declension nouns 3rd declension adjective with 1st, 2nd, 3rd declension plural nouns
nominative singular genitive singular nominative singular genitive singular
irata ancilla
iratus vir
iratus consul
irata imperatrix
iratae ancillae
irati viri
irati consulis
iratae imperatricis
celeres raedae
celeres pueri
celeria itinera
celerium raedarum
celerium puerorum
celerium itinerum

Adjectives can be:

  1. descriptive such as magnus (large) or brevis (short)
  2. possessive such as suus (his or her) or meus (my)
  3. interrogative such as qui vir (which man)
  4. demonstrative such as hic (this) or ille (that)
  5. indefinite such as quidam vir (a certain man)


Always remember the three words case, number and gender when you think of adjectives.

Sometimes one sees an adjective without a noun; this is a substantive adjective. It means that the noun has been mentioned in a previous sentence so it is understood here.

Exempli Gratia Here is a dish of apples. The good are on the left and the bad are on the right. We know that the good and bad are referring to apples from the first sentence so in Latin the word for apple is neuter plural so good and bad will be bona and mala, neuter plural forms. Apple is genitive plural; dish OF apples, but in the second sentence, the understood word apples is the subject of are so the adjectives must be nominative as well as neuter plural.

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