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 reasonableExtra examples His demands were becoming more and more unreasonable. I find her a bit unreasonable at times. She did not want to appear unreasonable. This clause in the contract was held unreasonable. It seems to be government policy to keep the exchange rate at an unreasonable level. It would be unreasonable to expect somebody to come at such short notice.