Meaning of “unreasonable” - Learner’s Dictionary

unreasonable

adjective uk us /ʌnˈriːzənəbl/

B2 not fair:

unreasonable demands/behaviour
[ + to do sth ] It seems unreasonable to expect one person to do both jobs.
unreasonably adverb

(Definition of “unreasonable” from the Cambridge Learner’s Dictionary © Cambridge University Press)