Antonyms of adj smug

1 sense of smug

Sense 1
smug, self-satisfied -- (marked by excessive complacency or self-satisfaction; "a smug glow of self-congratulation")

INDIRECT (VIA contented) -> discontented, discontent -- (showing or experiencing dissatisfaction or restless longing; "saw many discontent faces in the room"; "was discontented with his position")

Similarity of adj smug

1 sense of smug

Sense 1
smug, self-satisfied -- (marked by excessive complacency or self-satisfaction; "a smug glow of self-congratulation")
       => contented (vs. discontented), content -- (satisfied or showing satisfaction with things as they are; "a contented smile")