smarty
[noun]
Synonyms: smart aleck, know-it-all, *smartass, smarty-pants, wiseacre, wisecracker, wise guy, wisehead, wisenheimer

[TahlilGaran] English Synonym Dictionary ▲

smarty noun & adjective. ['smɑ:ti] Orig. US. Also (chiefly as noun) smartie. M19.
[from SMART adjective + -Y⁶, -IE.]
A. noun. A would-be smart, witty, or fashionable person, a know-all, a smart alec. M19.
b. adjective. Characteristic of or resembling a smarty; smart-alecky. L19.

Comb.:
smarty-boots, (orig. US) smarty-pants colloq. a smugly clever person, a smart alec.

[TahlilGaran] English Dictionary ▲