unreasonable
adjective
uk/ʌnˈriːzənəbl/ usnot fair or acceptable:
A merchant is not required to satisfy a customer's unreasonable demands.
be unreasonable for sb/sth to do sth It is not unreasonable for technical jobs to be filled by people with particular skills honed in industry.
be unreasonable to expect/suggest/think sth It would be unreasonable to expect annuity rates to remain high.
an unreasonable cost/expense/price
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reasonable