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Clownish
Negatively Viewed
While 'clownish' can seem fun, it's often used to criticize someone's behavior as foolish or embarrassing in serious situations. 
Informal Settings
'Clownish' is more suitable for informal language and can sound out of place in formal writing or speeches. 
Not Always Funny
Sometimes 'clownish' implies that someone isn't deliberately trying to be funny, but rather they are unintentionally acting in a silly way. 