The adjective can be variable or invariable.
1. Variable adjectives.
Most adjectives are variable in gender (masculine/feminine) and number (singular/plural).
| singular | plural | |
| masculine | ross-o | ross-i |
| feminine | ross-a | ross-e |
Some vary only in number (singular/plural), but remain unchanged in gender (i.e. they have the same ending for masculine and feminine).
| singular | plural | |
| masculine | elegant-e | elegant-i |
| feminine | elegant-e | elegant-i |
Others, a small part, vary in gender only in the plural.
| singular | plural | |
| masculine | entusiast-a ottimist-a | entusiast-i ottimist-i |
| feminine | entusiast-a ottimist-a | entusiast-e ottimist-e |
This type includes adjectives ending in:
- -ista: pessimista (pessimist).
- –cida: omicida (murderous).
- -ita: ipocrita (hypocritical).
- –asta: entusiasta (enthusiastic).
- -ota: idiota (idiot).