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gullible

or gul·la·ble

[guhl-uh-buh l]
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adjective
  1. easily deceived or cheated.
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Origin of gullible

First recorded in 1815–25; gull2 + -ible
Related formsgul·li·bil·i·ty, noungul·li·bly, adverb

Synonyms

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credulous, trusting, naive, innocent, simple, green.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for gullible

gullible

adjective
  1. easily taken in or tricked
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Derived Formsgullibility, noungullibly, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for gullible

adj.

1825, apparently a back-formation from gullibility. Gullable is attested from 1818.

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Online Etymology Dictionary, © 2010 Douglas Harper