Definition of "trackless" [track•less]

• Not running on tracks or rails. (adjective)
• Unmarked by trails or paths. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "He was familiar with every route in miles, whether roadway, trail, or "course by compass," as he termed trackless cruising in the desert."
• "The knowledge of them and of other cognate facts enables man in these days to map out the so-called trackless ocean into districts, and follow its well-known highways with precision and comparative safety."
• "He knows that the way on which he is about to enter is "trackless;" but so is the bird's: God will guide him as He guides the bird."