英和和英

without knowing it

without awareness

By mine own heart I know how dear

the state of having no knowledge

I have no means of knowing it.

in ignorance

not aware

I don't even know.

He can not be ignorant of them

It is impossible that he can be ignorant of them.

passing time of which one is unaware

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

He can not know them

It is impossible that he can know them.

I don't know.

to be completely unable to understand

He is an utter stranger―a complete stranger―a perfect stranger―to me.

in an unintelligent manner

in spite of oneself

I don't know

not made known

not known

It's no concern of mine.

as if you don't know

unclearly