noun – firm belief in the reliability, truth, or ability of someone or something.
synonyms: confidence, belief, faith, freedom from suspicion/doubt, sureness, certainty, certitude, assurance, conviction, credence, reliance
verb – believe in the reliability, truth, or ability of.
synonyms: have faith in, put/place one's trust in, have (every) confidence in, believe in, pin one's hopes/faith on, rely on, depend on, bank on, count on, be sure of, confide in