Invariable adjectives

Adjectives that don't change for gender

In Spanish, many adjectives end in -e or a consonant (like -l or -n). These adjectives use the exact same form for both masculine and feminine nouns.

The green book is interesting.
El libro verde es interesante.
The blue house is big.
La casa azul es grande.

Making invariable adjectives plural

While these adjectives ignore gender, they still must agree in number (singular vs. plural).

  • If the adjective ends in -e, add -s.
  • If the adjective ends in a consonant, add -es.
  • If the adjective ends in -z (like feliz), change the z to c and add -es.
EndingSingularPlural
-everdeverdes
consonantazulazules
-zfelizfelices

Here are some examples of invariable adjectives matching plural nouns:

You are intelligent students.
Ustedes son estudiantes inteligentes.
The blue cars are different.
Los carros azules son diferentes.

Pay special attention to the spelling change when feliz becomes plural:

The doctor is young and happy.
El doctor es joven y feliz.
The friends are young and happy.
Las amigas son jóvenes y felices.