An odd or fanciful or capricious idea. Synonyms:notion, whim, whimsy."He had a whimsy about flying to the moon" , "Whimsy can be humorous to someone with time to enjoy it"
... concentration of attention on the Old Testament, given the reformers' controversial and metaphysical habit of thought, could only precipitate the inevitable. While popular piety bubbled up into all sorts of emotional and captious sects, each with its pathetic insistence on some text or on some whimsey, but all inwardly inspired by an earnest religious hunger, academic and cultivated Protestantism became every day more pale and rationalistic. Mediocre natures continued to rehearse the old platitudes and tread the slippery middle courses of one orthodoxy ... — The Life of Reason • George Santayana
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