Gullible
来自Big Physics
early 19th century: from gull2 + -ible.
wiktionary
Either gull + -ible, or from dialectal Middle English gull(“newly hatched bird”), perhaps from Old Norse gulr, from the hue of its down. [1]
etymonline
gullible (adj.)
1821, apparently a back-formation from gullibility. Spelling gullable is attested from 1818.
