1. 轻信的；易受骗的；易上当的
If you describe someone as gullible, you mean they are easily tricked because they are too trusting.

1. easily tricked because of being too trusting

e.g. gullible tourists taken in by the shell game

2. naive and easily deceived or tricked

e.g. at that early age she had been gullible and in love

Synonym: fleeceablegreen