disapproval If you describe a person or organization as unaccountable, you are critical of them because they are not responsible to anyone for their actions, or do not feel they have to explain their actions to anyone. Economic policy in Europe should not be run by an unaccountable committee of governors of central banks
Something that is unaccountable does not seem to have any sensible explanation. For some unaccountable reason, it struck me as extremely funny = inexplicable + unaccountably un·ac·count·ably And then, unaccountably, she giggled
not to be accounted for or explained; "perceptible only as unaccountable influences that hinder progress"; "an unexplainable fear" free from control or responsibility