capricious
/kəˈpɹɪʃəs/adjective
Changing suddenly and without warning, guided by whim rather than reason.
Example sentences
- “Our capricious boss changed the whole schedule twice in one week.”
- “The capricious mountain weather turned from sunshine to hail in minutes.”
From 'caprice', a sudden whim. Often describes weather, moods, or an unpredictable boss, and is more critical in tone than 'spontaneous'.