Search Result for "skepticism": 
Wordnet 3.0

NOUN (2)

1. doubt about the truth of something;
[syn: incredulity, disbelief, skepticism, mental rejection]

2. the disbelief in any claims of ultimate knowledge;
[syn: agnosticism, skepticism, scepticism]

The Collaborative International Dictionary of English v.0.48:

Skepticism \Skep"ti*cism\, n. [Cf. F. scepticisme.] [Written also scepticism.] 1. An undecided, inquiring state of mind; doubt; uncertainty. [1913 Webster] That momentary amazement, and irresolution, and confusion, which is the result of skepticism. --Hune. [1913 Webster] 2. (Metaph.) The doctrine that no fact or principle can be certainly known; the tenet that all knowledge is uncertain; Pyrrohonism; universal doubt; the position that no fact or truth, however worthy of confidence, can be established on philosophical grounds; critical investigation or inquiry, as opposed to the positive assumption or assertion of certain principles. [1913 Webster] 3. (Theol.) A doubting of the truth of revelation, or a denial of the divine origin of the Christian religion, or of the being, perfections, or truth of God. [1913 Webster] Let no . . . secret skepticism lead any one to doubt whether this blessed prospect will be realized. --S. Miller. [1913 Webster]
WordNet (r) 3.0 (2006):

skepticism n 1: doubt about the truth of something [syn: incredulity, disbelief, skepticism, mental rejection] 2: the disbelief in any claims of ultimate knowledge [syn: agnosticism, skepticism, scepticism]
Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "skepticism": Humism, Pyrrhonism, agnosticism, apprehension, caution, cautiousness, concern, diffidence, disinclination to believe, distrust, distrustfulness, doubt, doubtfulness, dubiety, dubiousness, guardedness, half-belief, incertitude, inconvincibility, incredulity, leeriness, misdoubt, misgiving, mistrust, mistrustfulness, qualm, qualmishness, question, resistiveness to belief, scoffing, scruple, scrupulousness, self-doubt, shadow of doubt, skepticalness, suspicion, suspiciousness, total skepticism, tough-mindedness, uncertainty, unconvincibility, uncredulousness, unpersuadability, unpersuasibility, wariness, wonder