It keeps crossing my path lately. And it's making me slightly nuts!
If you've ever wondered, here's the answer.
These three words are NOT the same thing.
NOT the same thing.
Things are ELUSIVE when they get away from you. They elude you.
Things are ILLUSIVE when they trick you. Illusive means the same thing as: "deceiving by false show; deceitful; deceptive; false; illusory; unreal."
Things are ALLUSIVE when they are implied. We allude to things - we make reference to them.
I'm just sayin.