Continually slipping away
Else clues• Baffling
• Close to unattainable
• Difficult to describe
• Difficult to grasp
• Eely
• Hard to catch
• Hard to define
• Hard to describe
• Hard to express, as a concept
• Hard to get
• Hard to grasp
• Hard to nail down
• Hard to pin down
• Just out of reach
• Not easily caught
• Slippery