IPA: /smʌɡli/
KK: /smʌɡli/
In a way that shows too much satisfaction with oneself or one's achievements.
He smiled smugly after winning the debate.
Smugly is derived from the adjective "smug" (originating from the early 18th century, possibly from the dialectal English word "smugge," meaning neat or trim) and the adverbial suffix "-ly" (meaning in a manner of). The word "smugly" describes a manner that is self-satisfied or overly pleased with oneself.
Think of someone who is 'neat' or 'trim' ('smug') and how they might act 'in a manner of' ('-ly') being overly pleased with themselves.