Being wary means to be cautious or suspicious of something or someone. Antonyms for being wary include being trusting, naive, gullible, careless, and reckless. Trusting means having faith in someone or something without suspicion or doubt. Naive is a synonym for innocent, which means lacking experience of sophisticated understanding. Gullible is an antonym for being wary because it describes a person who is easily deceived or tricked. Careless means not taking enough care or attention to detail, whereas reckless implies a complete disregard for danger or consequences.