gullible
Definitions
Easily persuaded to believe something.
Easily deceived or cheated; credulous.
Examples
He was so gullible that he actually believed the moon was made of green cheese.
Don't be so gullible; nobody is going to give you a thousand dollars just for clicking a link.
The salesman took advantage of her gullible nature to sell her an overpriced vacuum cleaner.
Synonyms
naive credulous impressionable trusting unsuspecting ingenuous simple