Akademik

Умница, как попова курица

You are or someone is stupid

Var.: Умная умница - что светлая пуговица

Cf: If you had all the wit of the world, fools would fell you (Br.). Not all there (Am.). Nothing between the ears (Am.). Some men are wise and some are otherwise (Am., Br.). There is not much between the ears (Am.). There's nobody home (Am.). You haven't got the brains you were born with (Am.)

Русско-английский словарь пословиц и поговорок. Академик.ру. 2013.