Definify.com
Webster 1913 Edition
Smugly
Smug′ly
,adv.
 In a smug manner. 
[R.] 
Gay.
 Webster 1828 Edition
Smugly
SMUG'LY
,adv.
  Definition 2025
smugly
smugly
English
Adverb
smugly (comparative more smugly, superlative most smugly)
-  In a self-satisfied manner.
- He was smirking smugly at us.