a. Of or resembling a clown, or characteristic of a clown; ungainly; awkward. “Clownish hands.” Spenser. “Clownish mimic.” Prior.
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n. The manners of a clown; coarseness or rudeness of behavior. [ 1913 Webster ]
That plainness which the alamode people call clownishness. Locke. [ 1913 Webster ]