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Adjective

mercurial

IPA /mɜːˈkjʊəriəl/

Changing mood or behaviour quickly and unpredictably, so that other people find it difficult to know what to expect.

See example sentence: mercurial

His mercurial mood shifted from delight to irritation during dinner.

Adjective

fickle

IPA /ˈfɪkl/

Changing feelings, preferences or loyalties often and unpredictably, so that others cannot easily rely on them.

See example sentence: fickle

Her fickle friend cancelled their plans whenever a more exciting invitation arrived.

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