Too pleased or satisfied about something you have achieved or something you know. (Cambridge Dictionary)
Highly self-satisfied. (Merriam – Webster)
Trim or smart in dress: Spruce. (Merriam – Webster)
Scrupulously clean, neat, or correct: Tidy. (Merriam – Webster)
If you say that someone is smug, you are criticising the fact they seem very pleased with how good, clever, or lucky they are. (Collins Dictionary)
Having or showing an excessive pride in oneself or one’s achievements. (Oxford Dictionaries)
Why Danes are smug: comparative study of life satisfaction in the European Union.
Are pregnant women smug?
Smug couples patronise singles to feel better about themselves.