英和和英

not understood

He has no understanding

He lacks sense.

I didn't know

Don't realize

I have no clue.

I have no idea.

I don't know anything at all.

I don't know anything about ～ .

You're asking the wrong person.

I wish I can help you, but I don't know

not clear to the understanding

not noticed

difficult to understand

never fear

a state of not noticing at all

without knowing it

to be completely unable to understand

not conscious

not aware

not informed

not made known

not known

recognizable

not ever

in spite of oneself

I can not say for certain

I do not know for a certainty.

don't catch your meaning

Still don't understand