8 letters · 11 points in Scrabble
adjective naive and easily deceived or tricked
adjective easily tricked because of being too trusting
originOrigin uncertain. Either from gull (“to dupe, trick, fool”) + -ible; or alternatively from Middle English gole, goll, gol (“an unfledged bird, silly fellow”), perhaps from Old Norse gulr (“yellow, pale”), from the hue of its down.
Etymology from Wiktionary, CC BY-SA 3.0