Skeptic; Skeptical

Part of speech: adjective (a.)

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

2. Doubting or denying the truth of revelation, or the sacred Scriptures. The skeptical system subverts the whole foundation of morals. R. Hall. -- Skep"tac*al*ly, adv. -- Skep"tic*al*ness, n.