The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
- Not containing or crossed by any roads: roadless wilderness.
- Forbidden by law to contain or be crossed by any roads or to be entered by any vehicles: tracts of land designated by the government as roadless areas.