Definitions for "Elusive"
Tending to elude; using arts or deception to escape; adroitly escaping or evading; eluding the grasp; fallacious.
tending to avoid, escape, evade; we call manatees elusive because they are hard to find and observe - they can easily stay underwater for 3-6 minutes during which time they often swim away
difficult to describe; "a haunting elusive odor"