“He told me that it would be a good investment, and I was gullible enough to believe him.”
You gave some money to a guy as an investment, but it turned out to be a fraud. He took your money and didn't give it back. Now you're telling the police about what happened. You say:
He told me that it would be a good investment, and I was gullible enough to believe him.
"Investing" your money means using it in a way to hopefully earn more money in return later. You can invest your money in things like
- a business
- real estate
A "good investment" is a way of investing money that's likely to give you a large return.
It turned out to be a pretty good investment; we earned about 15% returns over two years.
A "gullible" person is someone who's easily tricked. They readily believe things that aren't true.
A: Ha ha! I fooled you!
B: Oh man, I'm so gullible. I can't believe I fell for that!
Being "gullible" is negative. A more positive way to talk about the same kind of characteristic is "trusting":
This is a phrase that people use when someone is tricked by a lie. For example, if your boyfriend cheated on you, you could say this to a friend:
He told me that he loved me, and I was dumb enough to believe him!
You can use adjectives like "dumb", "stupid", "gullible", "trusting", "foolish", etc.