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Definition of skeptical : 1. Doubting or denying the truth of revelation, or the sacred Scriptures.
2. Of or pertaining to a sceptic or skepticism; characterized by skepticism; hesitating to admit the certainly of doctrines or principles; doubting of everything.

Synonyms:

show-me, tentative, wondering, suspecting, atheistic, bewildered, unconvinced, speculative, negativistic, mistrustful, distrustful, undecided, inclined to think/believe/agree etc., sceptical, hinky, nescient, trustless, quizzical, certain, questioning, belief, inquisitive, atheistical, unsettled

distrusting, doubting, disbelieving, cynical, uncertain, wary, unsure

dubious, suspicious, unbelieving, incredulous, doubtful

doubting Thomas

Usage examples:

• The operator looked skeptical instead. - "Eight Keys to Eden", Mark Irvin Clifton.
• " I am staggered and- a bit skeptical. - "Master Tales of Mystery, Volume 3", Collected and Arranged by Francis J. Reynolds.
• He looked astonished, skeptical, then pained. - "Roof and Meadow", Dallas Lore Sharp.