Inexplicable
Part of speech: adjective
Definition: Impossible to explain; not easily accounted for.
Example sentence: I am very emotionally affected by sound. Sounds are the inexplicable... There is a sound you hear in your head, it's your nerves, or your blood running.
Unaccountable
Part of speech: adjective
Definition: inexplicable; unable to account for, or explainnot responsible; free from accountability or control