Adjective Agreement: Complete Guide

Spanish adjectives are not decorative add-ons: they are grammatical partners of the noun they describe, and they change their shape to match it. This master reference pulls together every rule about agreement, plural formation, position, and irregular behavior into a single page. If you're unsure which ending to use, or whether an adjective even changes at all, start here.

The core principle is simple: an adjective agrees with its noun in gender (masculine/feminine) and number (singular/plural). Everything else in this guide is a variation on that rule.

The Big Picture

Spanish adjectives fall into three main shape categories:

The trick is knowing which category any given adjective belongs to. Most of this guide explains how to tell.

1. Four-Form Adjectives (-o / -a / -os / -as)

This is the biggest and most regular group. If the base (masculine singular) form ends in -o, the adjective has four distinct forms.

When you describe a mixed group (some masculine, some feminine), Spanish defaults to the masculine plural:

Even ten women and one man still take the masculine plural — it's grammar, not arithmetic. For the full breakdown see four-form adjectives.

2. Two-Form Adjectives (-e, -ista, and most consonants)

Adjectives whose base form ends in -e, in -ista, or in a consonant (with some exceptions) have only two forms: one for singular and one for plural. Gender doesn't affect them.

Notice that feliz becomes felices in the plural — the z changes to c before adding -es. This is a general spelling rule: see the plural section below. For a full list see two-form adjectives.

3. Invariable Adjectives

A small but important group never changes at all. These include some color names that come from nouns, and a handful of loanwords and compound adjectives.

These invariable colors resist plural -s in careful writing, though you'll hear naranjas and rosas colloquially. The safe bet in writing is to leave them unchanged. See invariable adjectives for more.

4. Nationality Adjectives — A Special Case

Nationalities usually follow the four-form pattern, but there's one twist: when a nationality adjective ends in a consonant in its base form, it still adds -a for the feminine, which is unusual for consonant-ending adjectives.

Notice that the written accent on francés disappears in francesa, franceses, and francesas — the stress moves to a new syllable and no longer needs marking. Nationalities ending in -e or -í (like canadiense, marroquí) still have only two forms. See nationality adjectives for the complete list.

5. Plural Formation — All the Rules

Turning a singular adjective into a plural one follows the same rules as nouns:

6. Adjective Position

The default in Spanish is adjective after noun, which is the opposite of English:

But some adjectives come before the noun for grammatical or stylistic reasons. The summary:

For the full discussion see adjective position.

7. Shortened Forms (Apocopation)

Several common adjectives drop their final -o when they appear directly before a masculine singular noun. This is called apocopation.

Grande shortens to gran before any singular noun regardless of gender — and its meaning shifts from "big" to "great":

Santo shortens to San before most masculine names (San Juan, San Pedro) but stays full before names starting with Do- or To- (Santo Domingo, Santo Tomás).

See shortened forms for a deeper look.

8. Adjectives That Change Meaning by Position

A handful of common adjectives mean different things depending on whether they come before or after the noun. Before the noun they tend to mean something figurative; after the noun they tend to mean something concrete.

See meaning change by position for full discussion.

9. Past Participles as Adjectives

When a past participle (cantado, comido, vivido, roto, abierto...) functions as an adjective, it agrees in gender and number like any four-form adjective.

This is the same participle you'd use in a compound tense like he comido, but there it doesn't agree because it's part of the verb. Only when the participle is acting like an adjective (after estar, ser, or modifying a noun directly) does it take the four endings.

See past participle as adjective.

10. Multiple Adjectives at Once

Spanish can stack adjectives, but the usual pattern is to put one before the noun and one or more after, or to join them with y after the noun:

When you list several adjectives after the noun, separate them with commas and use y before the last one, just as in English. All of them agree with the noun:

11. The Decision Flow

Put everything together with this flow when you meet a new adjective:

12. Putting It Together

Here are sentences that pull several of these rules into one place.

Summary

• Most adjectives take four forms (alto/alta/altos/altas).
• Adjectives ending in -e, -ista, or a consonant usually have two forms.
• Invariable colors (naranja, rosa, café) never change.
• Nationality adjectives ending in a consonant add -a for the feminine — a special case.
• Plural adds -s after a vowel and -es after a consonant, with z → c before -es.
• Shortened forms appear before masculine singular nouns: buen, mal, primer, tercer, algún, ningún, un, and gran before any singular noun.
• A handful of adjectives change meaning based on position.
• Past participles agree when they act like adjectives.
• When stacking multiple adjectives, keep the sentence clear and the agreement consistent.

Master these twelve rules and you'll handle almost every Spanish adjective you meet.