fickle

Definitions

Changing frequently, especially as regards one's loyalties, interests, or affection.

Characterized by erratic changeableness or instability.

Examples

The weather in the mountains is notoriously fickle, changing from sunshine to snow in a matter of minutes.

He is a fickle fan who only supports the team when they are winning.

Her fickle nature made it difficult for her to maintain long-term friendships.

Synonyms

capricious mercurial volatile changeable fanciful unpredictable erratic

Antonyms

constant steadfast stable reliable dependable consistent resolute