Definitions
American Heritage® Dictionary of the English Language, Fourth Edition
- adj. Easily deceived or duped.
Century Dictionary and Cyclopedia
- Easily gulled or cheated.
Wiktionary
- adj. Easily deceived or duped; naïve, easily cheated or fooled.
GNU Webster's 1913
- adj. Easily gulled; that may be duped.
WordNet 3.0
- adj. easily tricked because of being too trusting
- adj. naive and easily deceived or tricked
Etymologies
- From gull2.
Examples
“He chastised what he termed gullible Western media for repeating the US envoys comments without seeking the government's side of the story.”
“Most of these posts seem to relish in their own absurdity (I'm looking at you, TÖRdötCÖM), and the point of embarassing the gullible is missed, with instead the emphasis being placed on how well-crafted the hoax appears or the right timing of things (neither of which matter).”
“Dude, I checked, gullible is totally in the dictionary”
Did you know the word “gullible” doesn’t appear in the dictionary?
“In early casting breakdowns for the role, Shane is described as a gullible and enthusiastic baseball player.”
“May 10th, 2008 2: 45 pm ET how freakin gullible does billary think americans are (except her hardcore cult followers who she'll lead to the gates of hell). she voted yes on the iraq war and now goin against it? what a idiot, shouldnt have voted yes in the first place”
“The star is a hapless jock who seems to have the word gullible stamped on his forehead.”
“Hey AFP, did you know the word gullible doesn't appear in the French-English dictionary?”
“A friend once made the preposterous claim that the word gullible wasn't in the dictionary.”
“Does the word gullible appear in the AP stylebook?”
“In fact, I was told that if you look up the word gullible in the dictionary you will find my picture.”
Lists
These user-created lists contain the word ‘gullible’.
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GRE Barrons Wordlist
A complete Barron's Wordlist for GRE preparation. Your online flashcard replacement.
abase, abash, abate, abbreviate, abdicate, aberrant, aberration, abet, abeyance, abhor, abject, abjure and 4084 more...
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bird ad(d)jectives as objectives
the rules are simple. make or list (new) adjectives out of bird names and/or traits
gullible, crowable, hummerable, hawkable, phoenixible, emutional, tweetable, warblerible, dodoable, swantastic, snipeable, hoopoeible and 101 more...
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George Owell's works
pseudonym, Trotsky, Troskyist, apparatchik, purge, ostensible, gullibility, gullible, succumb, enamored, dystopia, nuzzle and 5 more...

Kristianto2010 This does not mean that love is gullible, but that it does not think the worst (as is the way of the world). It retains its faith. Love is not deceived . . . but it is always ready to give the benefit of the doubt. ODB May-11, 2011.
May 10, 2011
gangerh I have it on good authority that it won't be included in the 2009 OED Jan 23, 2008
mollusque "Gullible" isn't listed in Theodore Bernstein's Reverse Dictionary. Nov 30, 2007
uselessness Made you look! Nov 30, 2007