un·ac·count·ably /-ˈkaʊntəbli/
(ad.)不能說明地
Un·ac·count·a·ble a.
1. Not accountable or responsible; free from control.
2. Not to be accounted for; inexplicable; not consonant with reason or rule; strange; mysterious.
-- Un*ac*count*a*ble*ness}, n. -- Un*ac*count*a*bly, adv.
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unaccountably
adv : in an unaccountable manner; "in the book, a tycoon
unaccountably becomes the hero's friend"