英和和英

I can do nothing

To do my utmost, I can not do it

He is good for nothing.

the state of a task of being impossible

He is nothing of a scholar―no scholar （at all）.

the state or condition of being unconvinced

the feeling of being impatient

an inability to stay awake

I'm not good at anything.

I can't do it yet.

Can't do it well

I can't do anything.

not capable of being obtained

be unable

You must not take an impossible task on yourself.

not to be able to accomplish

of a condition, intolerable

incapable of being reversed

a feeling of being unable to manage

I wouldn't dare.

Things I will never achieve

I can't ask for money so often.

You can't get blood out of a stone.

must not

the state of being irreversible

That is not to be done―impossible―impracticable.

the degree to which something is not feasible

something that cannot be done

He is not much of a scholar―not much of a one.

inability to persuade