Wordnet 3.0
ADVERB (1)
1.
in an unaccountable manner;
- Example: "in the book, a tycoon unaccountably becomes the hero's friend"
The Collaborative International Dictionary of English v.0.48:
Unaccountable \Un`ac*count"a*ble\, a.
1. Not accountable or responsible; free from control.
--South.
[1913 Webster]
2. Not to be accounted for; inexplicable; not consonant with
reason or rule; strange; mysterious.
[1913 Webster] -- Un`ac*count"a*ble*ness], n. --
Un`ac*count"a*bly, adv.
[1913 Webster]
[1913 Webster]
WordNet (r) 3.0 (2006):
unaccountably
adv 1: in an unaccountable manner; "in the book, a tycoon
unaccountably becomes the hero's friend"