not fair; expecting too much The job was beginning to make unreasonable demands on his free time. The fees they charge are not unreasonable. It would be unreasonable to expect somebody to come at such short notice. He was being totally unreasonable about it. opposite reasonable
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noun [uncountable]
NAmE//ʌnˈrizənəbli//, NAmE//ʌnˈriznəbli//
adverbSee unreasonable in the Oxford Advanced Learner's DictionaryCheck pronunciation: unreasonable