IPA: /ˈtreɪsləs/
KK: /ˈtreɪsləs/
Something that cannot be followed or discovered; it leaves no signs or evidence behind.
The thief left a traceless escape route, making it difficult for the police to find any clues.
Traceless → It is formed from "trace" (from Old French *tracer*, meaning to draw or mark) and "-less" (meaning without). The word "traceless" means without a trace or mark left behind.
Think of something that leaves no 'mark' or 'drawing' behind — 'trace' means to mark, and '-less' means without.