smug /smʌɡ/verb 4adjective 3noun 1forms 5 verb4 •to adopt an offensively self-complacent expression. •(no longer used) To make smug, or spruce.Thus said, he smug'd his beard, and stroked up fair. — 1612 •(slang, no longer used) To seize; to confiscate. •(slang, no longer used) To hush up. adjective3 •Irritatingly pleased with oneself; offensively self-complacent, self-satisfied.Kate looked extremely smug this morning. •Showing smugness; showing self-complacency, self-satisfaction. •(no longer used) Studiously neat or nice, especially in dress; spruce; affectedly precise; smooth and prim.They be so smug and smooth. — 1556 noun1 •(no longer used) The smuggling trade.Have not they some term by which they distinguish the illicit trade? — They usually call it the Smug-pigeon. — 1830 formssmugged · smugging · smugs · smugger · smuggest