capricious

/kəˈpɹɪʃəs/adjective

Changing suddenly and without warning, guided by whim rather than reason.

Example sentence

“Our capricious boss changed the whole schedule twice in one week.”

From 'caprice', a sudden whim. Often describes weather, moods, or an unpredictable boss, and is more critical in tone than 'spontaneous'.

Related words

capsuleA tiny case that holds a single dose of medicine.canyonA deep, narrow valley with steep sides, carved through rock by a river.captivateTo hold someone's full attention through charm or fascination.canoeingThe sport of paddling or racing canoes or kayaks on the water.careerThe type of work a person does through their life, especially a profession followed seriously over many years.canoeA light, narrow boat that one or more people move through the water using paddles with a single blade.