Similar word to quirk:

aberration, caprice, characteristic, conceit, crotchet, eccentricity, equivocation, fancy, fetish, foible, habit, humor, idiosyncrasy, idée fixe, irregularity, kink, knack, mannerism, peculiarity, quibble, singularity, subterfuge, trait, turn, twist, vagary, whim, whimsy


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