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In Spanish, adjectives must agree with the noun (or pronoun) they describe in gender and in number. This means that if the noun an adejective describes is feminine, the adjective must be feminine, and if that same noun is also plural, the adjective will be feminine AND plural as well.
Noun
las faldas
Noun is feminine and plural
Noun and Adjective
las faldas bonitas
Noun and adjective both feminine and plural
Descriptive Adjectives
Spanish adjectives are usually listed in their masculine singular form in dictionaries, so it is important to know how to match these masculine singular adjectives to whatever noun you happen to be describing. Most adjectives end in -o, -e, - or a consonant in their singular masculine forms. Below you will find the rules for matching these adjectives to their respective nouns in gender and number.
Adjectives that End in -o
Adjectives that end in -o in the masculine singular form have four possible endings, one each for masculine, feminine, singular, and plural. These types of adjectives make up the majority of the adjectives in Spanish.
-o Adjective Endings
Singular Plural
Masculine -o -os^^
Feminine -a -as
To change the masculine singular form of an adjective to match a feminine noun, replac the -o ending with -a.
Es un perro negro.
It's a black dog.
Es una camisa negra.
It's a black shirt.
To make an -o adjective plural in the masculine or feminine form, add -s to the singular ending.
El hombre es alto.
The man is tall.
Los hombres son altos.
The men are tall.
Soy delgada.
I'm thin.
Somos delgadas.
We're thin.
Adjectives that End in -e or -ista
Adjectives that end in -e or -ista do not change according to gender. They agree with both masculine and feminine nouns in the singular form, though they do change for number.
Example Gender of Noun and Adjective
Tengo un abuelo interesante.
Masculine
Mi abuela es interesante.
Feminine
Mi profesor es muy idealista.
Masculine
Mi profesora es muy idealista.
Feminine
To make an -e adjective plural, add an -s to the singular ending.
-e Adjective Endings
Singular Plural
Masculine -e -es
Feminine -e -es
Los árboles son verdes.
The trees are green.
Allí están las niñas grandes.
There are the big girls.
Adjectives that end in a consonant
Most adjectives that end in a consonant do not change according to gender, but do change for number, just like adjectives that end in -e.
El coche es azul.
The car is blue.
La gata feliz está en la sala.
The happy cat is in the living room.
To make an adjective that ends in a consonant plural, add -es to the singular ending.
-ista Adjective Endings
Singular Plural
Masculine -ista -istas
Feminine -ista -istas
El enigma es fácil.
The riddle is easy.
Los enigmas son fáciles.
Riddles are easy.
A la mujer joven le gusta este café.
The young woman likes this cafe.
A las mujeres jóvenes les gusta este café.
Young women like this cafe.
Exception: Adjectives that end in -z in the singular, change the -z to a -c before adding the plural ending.
El gato es feliz.
The cat is happy.
Los gatos son felices.
The cats are happy.
Exception: Adjectives that end in -or, -ón, or -ín do have feminine forms. Simply add -a or -as to the masculine singular form and delet the written accent if necessary.
Mi hermano es trabajador.
My brother is hardworking.
Mi hermana es trabajadora.
My sister is hardworking.
Mis hermanos son trabajadores.
My brothers are hardworking.
Mis hermanas son trabajadoras.
My sisters are hardworking..
Pablo es cabezón.
Pablo is stubborn.
Paula es cabezona.
Paula is stubborn.
Exception: Adjectives ending in -erior do not have a feminine form.
Está en el patio exterior del edificio
He's in the back patio of the building.
Está en la parte posterior del edificio.
He's in the back part of the building.
Now, check out this fancy summary table!
Summary
Masculine Feminine
Singular Plural Singular Plural
-o -os -a -as
-e -es -e -es
-ista -istas -ista -istas
-z -ces -z -ces
-or -ores -ora -oras
-ón -ones -ona -onas
-ín -ines -ina -inas
