capricious

adjective
UK /kəˈprɪʃəs/
US /kəˈprɪʃəs/

Changing your mind quickly and often for no clear reason.

The capricious weather kept changing from sunny to rainy all day.


OTHER MEANINGS

2. Acting suddenly on a whim without planning.

Her capricious decision to buy a boat surprised everyone.

3. Describing something that changes unpredictably.

The capricious winds made sailing dangerous.

4. Governed by chance rather than reason or rules.

The capricious rules of the game confused the players.