1. someone who is doubtful or noncommittal about something • Syn: doubter • Derivationally related forms: doubt (for: doubter), agnostical • Hypernyms: person, individual, someone, somebody, mortal, soul 2. a person who claims that they cannot have true knowledge about the existence of God (but does not deny that God might exist) • Derivationally related forms: agnostical • Hypernyms: religious person