Of or pertaining to a sceptic or skepticism; characterized by skepticism; hesitating to admit the certainly of doctrines or principles; doubting of everything.
source: Webster 1913
noun
someone who habitually doubts accepted beliefs
source: WordNet 3.0
One who is yet undecided as to what is true; one who is looking or inquiring for what is true; an inquirer after facts or reasons.
