doubtingly

In uncertain manner

In a manner expressing doubt or uncertainty; with skepticism or hesitation.

She looked at him doubtingly when he claimed to have finished the project.

The word is rare, with *doubtfully* serving the same purpose in most contexts.

skeptical

disbelievingly

In doubting manner

suspiciously · mistrustfully · dubiously · challengingly · dismissively · scoffingly · derisively · critically · negatively · dissentingly

cautious

warily

With watchful caution

gingerly · charily · apprehensively · nervously · uneasily · anxiously · timorously · fearfully · reservedly · cagily

uncertain

hesitantly

With uncertain manner

ambivalently · tentatively · unsurely · haltingly · falteringly · inconclusively · equivocally · noncommittally · diffidently

questioning

quizzically

With puzzled expression

wonderingly · curiously · perplexedly · speculatively · contemplatively · pensively · reflectively · analytically

Opposites
epistemic certainty/belief

doubtinglyconfidently

With self-assurance

certainly · trustingly · trustfully · unquestioningly · assuredly

Phrases
Family

doubting

Familiarity
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G