What is another word for non-gullible?
Pronunciation: [nˈɒnɡˈʌləbə͡l] (IPA) 
Non-gullible means not easily deceived or fooled. Some synonyms for this word are skeptical, cynical, astute, shrewd, discerning, suspicious, wary, and vigilant. Being non-gullible requires one to be critical and discerning in their thinking and to question everything before accepting it as true. Being skeptical is a natural defense mechanism that allows us to protect ourselves from fraud and deception. To be shrewd means to be clever and quick-witted, whereas astute refers to being perceptive and insightful. A non-gullible individual is also vigilant and aware of their surroundings, always on the lookout for suspicious behavior or false information.
