Definition of Elusive

Adjective: elusive i'loo-siv

Difficult to describe
"a haunting elusive odour"
Skilful at eluding capture
"a cabal of conspirators, each more elusive than the arch terrorist"
Difficult to detect or grasp by the mind or analyse
"that elusive thing the soul";
- subtle
Making great mental demands; hard to comprehend, solve or believe
- baffling, knotty, problematic, problematical, tough