gullibleyoudaoicibaDictYouDict[gullible 词源字典]
gullible: [19] Gullible is a derivative of the now archaic gull ‘dupe’, itself a verbal use of the noun gull ‘gullible person, simpleton’. This appears to have been a figurative extension of an earlier gull ‘newly hatched bird’ [14], which survived dialectally into the late 19th century, and was itself perhaps a noun use of the obsolete adjective gull ‘yellow’ (borrowed from Old Norse gulr and still extant in Swedish and Danish gul ‘yellow’). Some etymologists, however, derive the noun gull ‘simpleton’ from an obsolete verb gull ‘swallow’ [16], which goes back ultimately to Old French gole, goule ‘throat’ (source of English gullet).
[gullible etymology, gullible origin, 英语词源]
gullible (adj.)youdaoicibaDictYouDict
1821, apparently a back-formation from gullibility. Spelling gullable is attested from 1818.