Difficult to find, catch, or achieve. The elusive thief managed to escape the police once again.
Difficult to remember or recall. The elusive name of the song was on the tip of her tongue, but she just couldn't remember it.
Hard to define or describe. The concept of happiness can be quite elusive, varying greatly from person to person.
Tending to evade or avoid a clear or direct answer or commitment. The politician's response was deliberately elusive, revealing little about his actual plans.