adjective
smug
SMUG/smʌɡ/
Pleased with oneself in an irritatingly superior way.
The smug winner admires his trophy while his companion rolls his eyes.

Etymology
Possibly from Low German smuk, “neat,” smug first described a trim or spruce appearance. Its self-satisfied meaning developed from looking sleek or being affectedly pleased with one's dress.
In context
the man remains disturbingly smug, smiling, and even laughing during the hearing. There's no sign of remorse
More examples
- He looked smug after the prediction came true.
- Her reply sounded smugger than she intended.
- He wore the smuggest smile in the room.
Forms
smug · smugger · smuggest
smugness noun — irritating satisfaction with oneself
Similar words
- complacent
- Suggests satisfaction that overlooks risks or shortcomings.
- conceited
- Emphasizes an inflated opinion of one's abilities.