The words ‘allusive’, ‘elusive’, and ‘illusive’ are similar words. They all have the same root, though they do not mean the same thing. Their pronunciation is very similar, since only the vowel sound at the beginning is different.

All three words come from the Latin word ‘ludo’, which means ‘I play’, ‘I mock’, ‘I deceive’, or ‘I amuse myself’. ‘Allusive’ comes from the meaning of ‘I mock’ in the sense of ‘I mimic’. ‘Elusive’ and ‘illusive’ come from the meaning of deception. The modern descendants come from the base with Latin prefixes. For ‘allusive’, it is a form of ad- which means ‘to’. The e- prefix means ‘out of’, so ‘elusive’ it means ‘out of’ or ‘fleeing from deception’. Finally, a form of in- meaning ‘at’ or ‘upon’ is used for ‘illusive’, which roughly means ‘to deceive’. It also can mean ‘illusion upon’, though the meaning has drifted over the years.

 ‘Allusive’ is the adjective form of ‘allude’, which means to refer to something indirectly or to suggest another.

“The work alludes to the possibility that we may find life on other planets.”

Both of these are also related to the word ‘allusion’. Allusions are meant to be references to something, a hint, or something that the reader or listener is intended to get, but is not stated outright. This can also be common when the inference made is inappropriate or risque, though this is not always the case.

“The allusion to Lovecraft may have provided a warning to savvy players that it would turn out to be a horror story.”

When something is allusive, it means that the item in question makes use of allusions.

“The book was so allusive that it had a reference on nearly every page.” 

 ‘Elusive’ is the adjective form of ‘elude’, which means to escape from something or to shake off a pursuer.

“The robber eluded the police by ducking into the sewers and effectively disappearing.”

It can also be used metaphorically, such as to mean that something does not make sense.

“Even though he had studied the sentence for many hours, its meaning still eluded him.”

If something is elusive, then it defies capture or cannot be found, either in the literal sense or the metaphorical.

“Despite all the fan hype, the elusive author of the book never came out of hiding.” 

‘Illusive’ is related to ‘illusion’, which is a fairly common word in English. An illusion is something that seems to be something that it’s not. For instance, a mirage would be an illusion, as it appears to be water when it is really just sand.

“For a while, they were able to create the illusion of normalcy in their daily lives.”

To be illusive is to have the qualities of an illusion, meaning that it appears to be something that it is not, but it can also mean that the thing in question is unrealistic or unreachable.

“With every roadblock they hit in the race, they began to fear that the finish line was illusive.”

Because of the meanings of ‘illusive’ and ‘elusive’, they might be confused, since both of them describe something that cannot be had. However, it is better to use ‘illusive’ when talking about something that doesn’t seem real or possible. ‘Elusive’ is better used when something cannot be caught or understood.

To summarize, ‘allusive’ is used to describe something that makes a reference, hint, or other indirect speech. ‘Elusive’ is something that is hard to find, cannot be understood, or cannot be captured. ‘Illusive’ means that a thing has to do with illusions or other things that have to do with a state of unreality, including that something looks insurmountable.

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