a. 1. Not used; not habituated; unfamiliar; unused; -- with to. [ 1913 Webster ]
Chastened as a bullock unaccustomed to the yoke. Jer. xxxi. 18. [ 1913 Webster ]
2. Not usual; uncommon; strange; new. [ 1913 Webster ]
What unaccustomed cause procures her hither? Shak. [ 1913 Webster ]