E and -ista Adjectives 

Adjectives ending in -e or -ista do not change according to gender, only for number. Inteligente (intelligent), verde (green), caliente (hot), grande (big), and amable(kind/friendly) are examples of adjectives that end in -e.

Masculine singular:

Mi primo es interesante. 
My cousin is interesting.

Feminine singular:

Mi amiga es interesante. 
My friend is interesting.

Masculine plural:

Mis amigos son interesantes. 
My friends are interesting.

Spanish describing words ending in -ista include perfeccionista (perfectionist), materialista (materialistic), alarmista (alarmist), and extremista (extremist).

Feminine singular:

Mi mamá es idealista. 
My mom is idealistic.

Masculine singular:

Mi profesor es idealista. 
My teacher is idealistic.

Masculine plural:

Mis profesores son idealistas. 
My teachers are idealistic.