1
False appearance
A visual or sensory impression that does not correspond to physical reality.
Example
The mirror creates an illusory sense of additional space.
illusory
/ɪˈluːsəri/ · ih-LOO-suh-reeadjective
Not real or based on a misleading appearance.
Use illusory when something appears genuine, meaningful, or attainable but disappears under closer examination.
What illusory Really Means
The word becomes easier to use when its closely related senses are separated and compared.
2
False pattern
An apparent relationship produced by chance or biased observation.
Example
The apparent pattern was illusory, produced by random variation.
3
Unreal distinction
A difference that seems meaningful but lacks a genuine basis.
Example
Closer analysis showed that the division between the groups was largely illusory.
Use illusory Naturally
Notice how the surrounding noun or clause reveals the exact shade of meaning.
The mirror creates an illusory sense of additional space.
The apparent advantage proved illusory once costs were included.
A small sample can create an illusory pattern in random data.
Precision Matters
Illusory overlaps with several common words, but each carries a different emphasis.
illusory
vs.Appears real or meaningful despite lacking reality.
imaginary
Exists only in the imagination.
illusory
vs.Emphasises deceptive appearance or perception.
spurious
Appears valid but is actually false or unsupported.
illusory
vs.Is unreal rather than multiply interpretable.
ambiguous
Allows more than one plausible interpretation.
illusory
vs.Can be perceived but the perception is misleading.
imperceptible
Cannot or can barely be perceived.
Test illusory in Context
The pattern only seemed real because of random variation.
1
When the researchers repeated the analysis with a larger sample, the apparent relationship disappeared, suggesting that the original pattern had been ___.