If you describe someone as gullible, you mean they are easily tricked because they are too trusting.
例句
What point is there in admitting that the stories fed to the gullible public were false?...承认向轻信媒体的公众提供了不实报道有何意义呢?I'm so gullible I would have believed him.我很容易上当,可能会相信他的话。
英汉词典释义
adj.
易受骗的
The swindlers had roped into a number of gullible persons.骗子们已使一些轻信的人上了当。He’s so gullible he’ll believe anything.他太容易上当,什么事都相信。
英英词典释义
Adjective
1. naive and easily deceived or tricked;
"at that early age she had been gullible and in love"