UNACCOUNT'ABLE, adjective 1. Not to be accounted for. Such folly is unaccountable 2. Not explicable; not to be solved by reason or the light possessed; not reducible to rule. The union of soul and body is to us unaccountable 3. Not subject to account or control; not subject to answer; not responsible.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI