smug (smŭg) adj.
smug·ger, smug·gest Exhibiting or feeling great or offensive satisfaction with oneself or with one's situation; self-righteously complacent: "the smug look of a toad breakfasting on fat marsh flies"(William Pearson).
[Perhaps akin to Low German smuck, neat, from Middle Low German, from smucken, to adorn.] smug'ly adv., smug'ness n.