cred·u·lous \ˈkrejələs\adjective Etymology: Latin credulus, from credere 1.: ready or inclined to believe especially on slight or uncertain evidence; easily imposed upon < a boy very credulous of life — Sinclair Lewis > 2.: based upon or proceeding from credulity < credulous superstition > • cred·u·lous·lyadverb • cred·u·lous·nessnoun-es