Gender and number of Spanish adjectives

Adjectives must agree in gender (masculine, feminine) and number (singular, plural) with the noun they modify. 

• Esta camisa negra me la compró mi hermana. (My sister bought me this black shirt.)
• Me encantan los zapatos rojos. (I love red shoes.)

Masculine, feminine and plural forms of adjectives 

Adjectives are either masculine or feminine, singular or plural according to the noun they modify. 

Here are some categories regarding the gender and number of adjectives: 

1. adjectives ending in -o (masculine)
2. adjectives ending in -e and consonant (both masculine and feminine)
3. nouns ending in -z

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1. Adjectives ending in -o (masculine)

Masculine -o ending changes to -a in the feminine form. To form the plural, an -s is added to the singular ending. 

2. Adjectives ending in -e and consonant (both masculine and feminine)

Some adjectives have the same form for both masculine and feminine.

To form the plural, add -s to adjectives ending in -e, while -es to adjectives ending in consonant. 

3. Adjectives ending in -z (both masculine and feminine)

Adjectives ending in -z have the same form for both masculine and femenine, while to form the plural, z turns into c before adding the plural -es ending. 

Other masculine, feminine and plural endings

Here are some other categories regarding the gender and number of adjectives: 

1. adjectives ending in -án, -dor and -ón (masculine)
2. adjectives of nationality ending in -o (masculine)
3. adjectives ending in -és (masculine)
4. adjectives of nationality ending in -a, -án, -ense and í (both masculine and feminine) 
5. compound adjectives

1. Adjectives ending in -án, -dor and -ón (masculine)

To form the feminine form, add -a to the masculine ending.The plural form is created by adding -es to the masculine ending and -s to the feminine one.

The accent mark is dropped in both cases.

2. Adjectives of nationality ending in -o (masculine)

To form the feminine, this type of adjectives drops the -o and add -a. The plural form is created by adding -s to the singular form. 

3. Adjectives ending in -és

To form the feminine, this type of adjectives adds the -a to the masculine ending. The plural form is created by adding -s to the masculine form and -es to the feminine.

The accent mark is dropped in both cases.

4. Adjectives of nationality ending in -a, -án, -ense and í (both masculine and feminine) 

5. Compound adjectives

Compound adjectives add the plural to the last element. 

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*Please note that some adjectives may keep or drop the accent mark on their plural form.