Resembling, characteristic of, or befitting a clown; foolish, crude, or lacking sophistication; silly or buffoonish in behavior.
From clown + -ish (a suffix meaning 'having the qualities of' or 'somewhat like'). The suffix -ish is extremely productive in English and creates adjectives from nouns, as in 'foolish,' 'childish,' or 'Scottish.'
The '-ish' suffix lets English speakers be delightfully vague—'clownish' doesn't mean definitely a clown, just 'kind of clown-like,' giving us room for gentle insults and colorful descriptions.
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