Imaginary, illusory (6)

I believe the answer is:

unreal

I believe this clue is a double definition.

'imaginary' is the first definition.
(similar in meaning)

'illusory' is the second definition.
(similar in meaning)

(Other definitions for unreal that I've seen before include "Not actual or credible" , "Not genuine" , "fake" , "Dreamlike" , "Not actually existing" .)

I've seen this clue in The Mirror.

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