形容詞 gullible:

1. naive and easily deceived or tricked
   同義詞：fleeceable, green
2. easily tricked because of being too trusting

1. He's so gullible you could sell him anything.
   他非常容易上當，你可以賣給他任何東西。
2. Easily duped or deceived; gullible.
   易受騙的容易被人欺騙或欺辱的
3. Disposed to believe too readily; gullible.
   太容易相信的; 易受騙的
4. He must have been pretty gullible to fall for that old trick.
   他準是有點兒傻，才落入那慣用的圈套。

gul.li.ble

adj.（形容詞）
Easily deceived or duped.
易上當受騙的：容易被欺騙或愚弄的

來源：
From gull 2
源自 gull2

【引伸】
gul.libil.ity
n.（名詞）
gul.libly
adv.（副詞）