I am not a fool to trust him...

Are these sentences correct:
[color=red]1) I am not foolish to trust him.
[color=indigo]2) I am not a fool to trust him.

Do they mean:
a. It is true that I trust him, but that doesn’t mean I am foolish/a fool.
or:
b. I don’t trust him. It would be foolish of me to do that.

Gratefully,
Navi…

I don’t know if the sentences are OK for a NES
I would say
11) I am not so foolish to trust him.
12) I am not such a fool to trust him.

To me, what you say should have ‘as’ so that it conforms to the so … as and the such … as structures.

  1. I am not so foolish as to trust him.
  2. I am not such a fool as to trust him.

(I’d like comments if my observation is not correct)

I would suggest -

Not so foolish that I would trust him.

Not such a fool that I would trust him.

Alan

Yes, that is ‘so/such … that’ structure although it calls for another clause.

Says who?[YSaerTTEW443543]

TOEIC listening, talks: Information about a five-car collision at an intersection[YSaerTTEW443543]