Also found in: Thesaurus, Idioms.
1. Not common or usual: "The legislature has produced a new budget of unaccustomed austerity" (People).
2. Not being habituated. Used with to: is still unaccustomed to a life of stress.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
in an unaccustomed manner
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014