IPA: /ˈdjuːbiəsli/
KK: /ˈdubɪəsli/
In a way that shows doubt or uncertainty about something.
She looked at the proposal dubiously, unsure if it would work.
Dubiously → It is formed from "dubius" (from Latin, meaning doubtful) and the suffix "-ly" (meaning in a manner of). The word "dubiously" means in a manner that expresses doubt or uncertainty.
Think of the Latin word for doubtful, 'dubius', to remember that 'dubiously' means doing something in a way that shows uncertainty.