smug
He was good at his job, though not as good as he thought he was, and his smugness irritated Wycliffe.
It wasn't smugness or arrogance. It was a quiet self-confidence.
Plodding past all the tour buses, I couldn't help but feel a certain smugness at arriving on foot.

SMART Vocabulary: related words and phrases

Satisfied and complacent
at one with the worldidiom
be on to a good thingidiom
complacency
complacent
complacently
nicely
pride
rest on your laurelsidiom
rewardingly
sate
self-complacent
self-content
self-contented
self-contentedly
self-fulfilled
this is the life!idiom
triumphalism
undiscouraged
unenvious
virtuously

You can also find related words, phrases, and synonyms in the topics:

Showing arrogance and conceit