Gullible definition: easily deceived or cheated.. See examples of GULLIBLE used in a sentence. Definition of gullible adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Gullible means easily deceived or duped, naive, or credulous. Find the origin, pronunciation, and translations of gullible, as well as related words and antonyms, in this comprehensive online dictionary. The meaning of GULLIBLE is easily duped or cheated; especially : quick to believe something that is not true. How to use gullible in a sentence. Did you know?
