Allusive: Characterized by indirect references

Example: I’m tired of his allusive speech. He should just say what he means.
Vs
Elusive: Difficult to describe; remaining hidden or hard to catch

Example: That haunting, elusive odor was driving him crazy.
Vs
illusive– hallucination or magic trick; lacking in reality or substance or genuineness

Example:However, the mechanism by which ecp achieves its effect remains illusive.
In a nutshell: When a lawyer alludes to his client’s poor mother, he is being allusive. When the mole keeps eluding the traps you’ve set in the garden, it’s being elusive. We also speak of matters that are difficult to understand, identify, or remember as elusive. Illusions can be illusive, but we more often refer to them as illusory.







