British informal adjective meaning foolish, idiotic, or behaving like a prat — which in UK English is a mild insult for someone who acts stupidly or selfishly. Prattish behavior includes things like making pointless arguments, embarrassing yourself in public, or being unnecessarily difficult for no good reason. It's not a scorching insult — more of a fond eye-roll word — but it lands a clear judgment that whoever you're describing is being a bit of an idiot. Common in British sitcoms and everyday conversation.
Look, I know you're nervous, but don't be prattish about it — just apologize and move on.
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(UK, informal) Like a prat; foolish.
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Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.