Don't fall for anyone who tries to convince you that gullible isn't entered in the dictionary. It's right there, along with the run-on entries gullibility and gullibly. All three words descend from the verb gull, meaning "to deceive or take advantage of." The verb was borrowed into English from Anglo-French in the mid-16th century. Another relative is the noun gull, referring to a person who is easy to cheat—a word which is unrelated to the familiar word for a seabird, which is of Celtic origin.
I'm not gullible enough to believe something that outrageous. They sell overpriced souvenirs to gullible tourists.
Recent Examples on the WebAt a Russian troll farm, workers sow seeds of rebellion and anger online, posing as Brits, turning into influencers with the help of bots and then with the aid of gullible UK malcontents. Michael Phillips, Chicago Tribune, 20 Aug. 2022 Falling prices means there are likely fewer first-time investors entering the market right now, Chainalysis writes—and, by extension, fewer gullible newbies for scammers to entice with their typical promise of quick and exorbitant returns. Marco Quiroz-gutierrez, Fortune, 16 Aug. 2022 Some politicos say Cheney would be realistic about her chances running as a Republican against a cult figure like Trump who has hoodwinked millions of gullible Americans. Teresa M. Hanafin, BostonGlobe.com, 16 Aug. 2022 And there are bull traps—stocks rally for months, enticing gullible momentum investors, only to be followed by gut-wrenching drops. Andy Kessler, WSJ, 7 Aug. 2022 The good news is that reason ultimately intrudes on the fabulist thinking of the overeducated and gullible. John Tamny, Forbes, 22 May 2022 Collins was either gullible or she, too, was lying. Michael Tomasky, The New Republic, 3 May 2022 That speech, disingenuous then, or hopelessly gullible, is utterly disqualifying now. Yvonne Abraham, BostonGlobe.com, 24 June 2022 Classifying people as gullible is also good business for banks. Hannah Zeavin, Harper’s Magazine , 22 June 2022 See More