Unaccountable
Part of speech: adjective
Definition: inexplicable; unable to account for, or explain not responsible; free from accountability or control
Incomprehensible
Part of speech: adjective
Definition: impossible or very difficult to understand
Example sentence: Sometimes poetry, it is incomprehensible. But we need incomprehensible stuff! It is very healthy to talk about incomprehensible things! It is very healthy! We need it!