Scrabble Dictionary

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Yes, quirk is playable

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"Quirk" Definition

noun

A peculiarity of behavior; an idiosyncrasy: "Every man had his own quirks and twists” ( Harriet Beecher Stowe).
A sudden sharp turn or twist.
An equivocation; a quibble.
An unpredictable or unaccountable act or event; a vagary: a quirk of fate.
Architecture A lengthwise groove on a molding between the convex upper part and the soffit.