Etymology
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gullible (adj.)

1821, apparently a back-formation from gullibility. Spelling gullable is attested from 1818.

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Definitions of gullible

gullible (adj.)
naive and easily deceived or tricked;
at that early age she had been gullible and in love
Synonyms: fleeceable / green
gullible (adj.)
easily tricked because of being too trusting;
gullible tourists taken in by the shell game
From wordnet.princeton.edu

Dictionary entries near gullible

gulf

gull

Gullah

gullet

gullibility

gullible

Gulliver

gully

gulp

gum

gumbo