An absurdity (from the Greek word topazo meaning guess, assume) is what one may not assume in that it cannot be grasped by a certain account or sequence.
Consequently, what is plausible is opposed to what is absurd and what is necessary to what is impossible. And the intensity of absurdity is impossibility; for what is absurd might perhaps once come about, e.g. no one guesses all men taking a bath.
Making a guess at that, then, is false but not impossible, whereas what is impossible is both false and impossible. For example, if one would assert that a man is winged; for this account is an intensified false, since apart from being false it is also impossible.
Bibliography: J. Philoponus in Aristotle’s Physics
Translation – text editing: George Kotsalis
