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unaccountable (adj.)

1640s, "inexplicable," from un- (1) "not" + accountable (adj.) here meaning "of which an account can be given." Meaning "not liable to be called to account" is recorded from 1640s. Related: Unaccountably; unaccountability; unaccountableness.

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Definitions of unaccountable

unaccountable (adj.)
not to be accounted for or explained;
perceptible only as unaccountable influences that hinder progress
Synonyms: unexplainable
unaccountable (adj.)
free from control or responsibility;
From wordnet.princeton.edu