The quality of being illusive; deceptiveness; false show.

In a illusive fashion.

Under an illusion; deceived.

(countable) Anything that seems to be something that it is not. / (countable) A misapprehension; a belief in something that is in fact not true. / (countable) A magician’s trick.

Subject to or pertaining to an illusion, often used in the sense of an unrealistic expectation or an unreachable goal or outcome.

plural of illusion

An optical illusion whereby a disk appears smaller if surrounded by larger disks than if by smaller.

The optical illusion whereby the moon looks larger when it is low in the sky than otherwise.

An optical illusion whereby a horizontal bar looks wider when farther up a picture of railroad tracks than when lower.

(psychology) The illusion of proprioception that one's nose is growing longer.