英和和英

impossible to understand

an inability to understand

not understood

not able to be ascertained

impossible to come to understand

It is not impossible.

Can't explain well

not capable of persuading

be unable to remember

an inability to stay awake

barely able to be perceived

not capable of impressing

the state or condition of being unconvinced

to be nothing to the purpose―beside the purpose―beside the mark―irrelevant―impertinent

to be unable to be logically grasped

to be unable to think clearly

not capable of being resolved

not capable of being retracted

It is hard to understand―unintelligible―incomprehensible.

the state of a task of being impossible

not tractable

not capable of being obtained

unable to see

the feeling of being impatient

Can't tell the difference

not knowable

impossible to subdue

impossible to identify

impossible to measure

not possible to deny