Etymology
Advertisement

unreasonable (adj.)

mid-14c., "irrational, illogical," from un- (1) "not" + reasonable. From late 14c. as "excessive, going beyond what is sensible or realistic." Related: Unreasonably; unreasonableness.

Advertisement
Advertisement
Definitions of unreasonable

unreasonable (adj.)
not reasonable; not showing good judgment;
unreasonable (adj.)
beyond normal limits;
unreasonable demands
Synonyms: excessive / inordinate / undue
From wordnet.princeton.edu