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

Sounds like: eluding, illuding, alludinge, illusive, allusiv

See also: artful, difficult, hard, impalpable, unidentifiable

Encyclopedia: Elusive