Dictionary
un•ac•count•a•ble
Pronunciation: (un"u-koun'tu-bul), [key]—
adj.
1. impossible to account for; unexplained; inexplicable:
The boat has an unaccountable tendency to yaw.
2. exempt from being called to account; not answerable:
As a subordinate, he is unaccountable for errors in policy.Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.