IPA: /smʌɡɪst/
KK: /smʌgɪst/
Feeling or showing excessive pride in oneself or one's achievements.
He had the smuggest smile on his face after winning the award.
Comparative: smugger
Superlative: smuggest
Smuggest 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 suffix "-est" (indicating the superlative form). The word "smuggest" refers to the highest degree of smugness, or being excessively self-satisfied or complacent.
Think of someone who is the most 'neat' or 'trim' in their self-satisfaction — that's what 'smuggest' means, being the most self-satisfied.