Adjective Agreement

Every ordinary Latin adjective describes a noun by matching its gender, number, and case. This agreement lets Latin keep a noun and its adjective together grammatically even when another word comes between them. English usually changes neither adjective form nor position—“a good farmer,” “good women,” “with a good plan”—so an English-speaking learner must build a new three-feature habit.

Agreement does not mean that noun and adjective must have the same final letters or belong to the same declension. In agricola bonus, first-declension agricola and second-declension bonus are both masculine nominative singular. Their different endings express the same feature bundle through different paradigms.

The three features

First determine the noun’s form and function; then choose the corresponding adjective form from the adjective’s own paradigm.

Agricola is grammatically masculine despite its -a, so bonus is masculine nominative singular. Guessing gender from the last letter would produce the wrong feminine bona.

Fēmina is first-declension; fortis is a third-declension adjective. Both are feminine nominative singular, even though only fēmina ends in -a.

Neuter accusative singular magnum agrees with dōnum. Masculine dative singular grātō agrees with amīcō. Each adjective follows its own head, not whichever noun is nearest.

Lexical gender, not natural appearance

Gender belongs to the noun’s dictionary entry. Natural sex often aligns with grammatical gender for people, but declension and ending alone do not decide it. Agricola “farmer” and nauta “sailor” are normally masculine; manus “hand” is feminine; nōmen “name” is neuter.

Masculine nauta requires fessus. Feminine accusative manum requires dextram. The adjective cannot copy the noun’s fourth-declension ending because dexter, dextra, dextrum has its own first- and second-declension forms.

Neuter nominative singular nōmen takes novum. The ending -um in the adjective does not make the noun second-declension; it simply realizes neuter nominative singular in the adjective’s paradigm.

Case follows the whole noun phrase

The adjective shares the case assigned to its head noun. Changing the phrase’s function therefore changes both words.

The first phrase is nominative subject; the second is accusative object. English leaves “long” unchanged, but Latin marks the change twice.

In with location governs the ablative, so both viā and longā are ablative singular.

Attributive and predicative agreement

An attributive adjective sits inside the noun phrase: puella laeta “the happy girl.” A predicative adjective states something about a noun through a linking verb: puella laeta est “the girl is happy.” Both agree.

Here laeta and tristis are attributive: each quality is packaged inside its noun phrase. Latin often lets context and position guide this interpretation rather than imposing an article-based contrast like English “a happy girl” versus “the girl is happy.”

Predicative laeta remains feminine nominative singular because it is predicated of nominative puella. In an accusative-and-infinitive construction, both subject and predicate become accusative: puellam laetam esse sciō, “I know that the girl is happy.”

Distance and position do not cancel agreement

Latin word order is flexible. An adjective may precede its noun, follow it, or be separated from it for focus, rhythm, or the framing of a phrase. Agreement keeps the dependency visible.

Accusative feminine singular magnam agrees with distant tempestātem, not with nearer masculine nauta or neuter perīculum. This separation is marked in simple teaching prose but normal as a resource of (formal) rhetoric and (literary) style.

Postposed magnam helps focus or contrast the quality, but the underlying agreement is unchanged. Position creates information structure, not a new case relation.

Agreement with more than one noun

With coordinated heads, the adjective is normally plural. Two masculine nouns take masculine plural; two feminine nouns take feminine plural; mixed personal genders normally take masculine plural; coordinated neuters can take neuter plural.

Feminine plural fessae agrees with māter et fīlia. If a predicate described pater et fīlius, it would be masculine plural. More complex choices involving proximity or agreement by sense belong to Adjective Agreement with Multiple Nouns.

Productive rule and genuine exceptions

Agreement is productive throughout Classical Latin. What must be memorized is each noun’s gender and each adjective’s paradigm. A few pronominal adjectives, such as ūnus, ūna, ūnum, use special genitive singular ūnīus and dative singular ūnī; Greek adjectives and indeclinable forms require separate treatment. (Poetic/literary) texts may place partners dramatically far apart or use meaning-based agreement, but they do not abolish the agreement system. (Late/Medieval) variation should not be projected into neutral Classical composition.

An attributed text should retain its edition’s spelling rather than receive teaching macrons:

Feminine nominative singular magna agrees with feminine vīs, while fronted genitive cōnsuētūdinis depends on vīs. The ordering highlights habit before stating its power; information structure does not weaken the agreement. The quotation itself remains unmacronized.

A production checklist

1. Find the head noun and its dictionary gender.
2. Choose singular or plural.
3. Assign case from the phrase’s syntactic role.
4. Select that gender-number-case cell from the adjective’s own paradigm.
5. Place the adjective according to clarity and focus, not English adjacency alone.

Common Mistakes

1. Matching a masculine first-declension noun as feminine

2. Copying the noun’s visible ending

3. Matching the adjective to the nearest noun

4. Leaving a predicate adjective in the nominative inside indirect statement

Key Takeaways

An adjective agrees with its head in gender, number, and case but keeps the endings of its own declensional class. Gender comes from the noun’s lexical entry, case from syntax, and number from reference. Position can add focus or rhythm; agreement, not nearness or matching letters, identifies the dependency.