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"smug" is also used as a crossword clue. If that's what you saw, the answer is often complacent (10 letters).
Definitions
Too pleased with oneself in an irritating way.
Word origin
Originally "spruce, neat," from Low German smuk (“pretty”), from Middle Low German smuk (“lithe, delicate, neat, trim”), although the g of the English word is not easily explained. The ultimate source should be Proto-West Germanic *smeugan (“to crawl, creep”).
Used in a sentence
“Kate looked extremely smug this morning.”
“a smug look on her face”
“They be so smug and smooth.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer1 curated clues
01“smirky”4 letters
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