IPA: /ˈskɛptɪkli/
KK: /ˈskɛptɪkli/
In a way that shows doubt or a lack of belief in something.
She looked at the proposal skeptically, unsure if it would really work.
Skeptically → It is formed from "skepticus" (from Greek "skeptikos", meaning thoughtful or reflective) and the suffix "-ally" (meaning in a manner of). The word "skeptically" means in a manner that shows doubt or questioning.
Think of being 'thoughtful' ('skepticus') when you are 'questioning' something — that's why acting skeptically means to doubt or question.