Two Groups of Italian Adjectives

Many adjectives have a feminine form (ending in “-a”) and a masculine form (ending in “-o”).
The plural ends in “-e” for feminine adjectives and in “-i” for masculine adjectives.
These adjectives with four forms (two gender, singular and plural form) are known as “adjectives with four endings”.
If you want to learn more and you are working with Italian grammar, the term to search for is: aggettivi a quattro uscite.

💬 Examples:
bello (m, sg) – beautiful
bella (f, sg) – beautiful
belli (m, pl) – beautiful
belle (f, pl) – beautiful
alto (m, sg) – tall
un uomo alto – a tall man
alta (f, sg) – tall
una donna alta – a tall woman
alti (m, pl) – tall
dei ragazzi alti – some tall boys
alte (f, pl) – tall
delle ragazze alte – some tall girls

Adjectives with the singular ending “-e” end in “-i” in the plural belong to the second group of Italian adjectives.
If you want to learn more and you are working with a grammar in Italian, the term to search for is: aggettivi a due uscite.

💬 Examples:
grande (m, sg) – big
un libro grande – a big book
grande (f, sg) – big
una casa grande – a big house
grandi (m, pl) – big
libri grandi – big books
grandi (f, pl) – big
case grandi – big houses

Some adjectives are invariable and are the same in the singular and in the plural, regardless of whether they are masculine or feminine.
Adjectives that only exist in one form are referred to as "aggettivi invariabili/monofinite".

💬 Examples:
un vestito blu (m, sg) – a blue dress
una camicia blu (f, sg) – a blue shirt
dei vestiti blu (m, pl) – some blue dresses
delle camicie blu (f, pl) – some blue shirts

➠ Adjective Placement in Sentences