whim - definition and synonyms

noun [countable] 

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  1. a sudden feeling that you must have or must do something. This word often suggests that what someone wants is not important

    A devoted secretary catered to his every whim.

    at someone’s whim:

    Prisoners were executed at the captain’s whim.

    on a whim:

    On a whim, she decided to go away for the weekend.