n. Lack of reason or rationality; unreasonableness; irrationality.
n. Nonsense; folly; absurdity.
v. To prove to be unreasonable; disprove by argument.
the GNU version of the Collaborative International Dictionary of English
n. Want of reason; unreasonableness; absurdity.
v. To undo, disprove, or refute by reasoning.
The Century Dictionary and Cyclopedia
n. Lack of reason; unreasonableness; irrationality; nonsense; folly; absurdity.
To prove to be unreasonable; disprove by argument.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the state of being irrational; lacking powers of understanding
Word Usage
"Or again, the term unreason is sometimes used rather more reasonably; for a sort of loose or elliptical statement, which is at least illogical in form."