I am not a fool to trust him...

[Navi]

Are these sentences correct:
1) I am not foolish to trust him.
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..

[E2e4]

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.

[Anglophile]

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)
_________________
Anglophile
I know only one thing - that is that I know nothing.

[Alan]

I would suggest -

Not so foolish that I would trust him.

Not such a fool that I would trust him.

Alan
_________________
English as a Second Language
You can read my ESL story Present Simple

[Anglophile]

Yes, that is 'so/such ... that' structure although it calls for another clause.
_________________
Anglophile
I know only one thing - that is that I know nothing.

[Torsten]

Says who?

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