Adjective
capricious
IPA /kəˈprɪʃəs/
Changing decisions, moods or behaviour suddenly and unpredictably.
See example sentence: capricious
The capricious owner changed the opening hours almost every week.
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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.
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