That it was a Utopia, there being no known method from the known to the unknown: an infinity renderable equally finite by the suppositious apposition of one or more bodies equally of the same and of different magnitudes: a mobility of illusory forms immobilised in space, remobilised in air: a past which possibly had ceased to exist as a present before its probable spectators had entered actual present existence.
There are no more uses of "illusory" in the book.
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The apparent progress might be illusory.
Secret activities offer presidents the alluring but often illusory promise that they can achieve foreign policy goals without the bothersome debate and open decision that are staples of democracy.