skeptical

adj. doubtful, questioning the validity of claims

"Skeptic" redirects here. For magazines, see Skeptic (magazine) and The Skeptic In ordinary usage, skepticism or scepticism (Greek: skeptomai, to look about, to consider; see also spelling differences) refers to an attitude of doubt or a disposition to incredulity either in general or toward a particular object, the doctrine that true knowledge or knowledge in a particular area is uncertain, or the method of suspended judgment, systematic doubt, or criticism that is characteristic of skeptics (Merriam–Webster).
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Adjective
1. denying or questioning the tenets of especially a religion; "a skeptical approach to the nature of miracles"
(synonym) disbelieving, sceptical, unbelieving
(similar) incredulous
2. marked by or given to doubt; "a skeptical attitude"; "a skeptical listener"
(synonym) doubting, questioning, sceptical
(similar) distrustful

(a.)
Of or pertaining to a sceptic or skepticism; characterized by skepticism; hesitating to admit the certainly of doctrines or principles; doubting of everything.
  

(a.)
Doubting or denying the truth of revelation, or the sacred Scriptures.
  

Synonyms and related words:
Humean, Pyrrhonic, agnostic, ambiguous, capricious, cautious, chancy, changeable, cynical, dicey, disbelieving, disinclined to believe, disposed to doubt, dissenting, distrustful, doubtful, doubting, dubious, equivocal, erratic, fickle, freethinking, from Missouri, guarded, hard of belief, hesitant, hesitating, impervious to persuasion, in doubt, incalculable, inconvincible, incredulous, indecisive, indemonstrable, irresolute, leery, mistrustful, mistrusting, polysemous, questioning, scrupulous, shy, shy of belief, skeptic, suspecting, suspicious, touch-and-go, unaccountable, unbelieving, uncertain, unconfirmable, unconvinced, unconvincible, uncredulous, undivinable, unforeseeable, unpersuadable, unpersuaded, unpersuasible, unpredictable, unprovable, unsure, untrusting, unverifiable, unwilling to accept, variable, wary, wavering, whimsical