/ smʌg; NAmE / adjective
( disapproving ) looking or feeling too pleased about sth you have done or achieved
SYN complacent :
a smug expression / smile / face, etc.
What are you looking so smug about?
► smug·ly adverb
► smug·ness noun [ U ]
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WORD ORIGIN
mid 16th cent. (originally in the sense neat, spruce ): from Low German smuk pretty.