The word "unreasonable" means something that is not fair, logical, or sensible. It refers to actions or beliefs that are not reasonable or cannot be justified. Full definition
It isn't unreasonable for parents to walk into their child's school and expect the air to be free from harmful contaminants. (qaeducation.co.uk)
It's not unreasonable for banks to be selective in who they lend to, especially given their squeezed margins. (coindesk.com)
There is no mention of the right to trial by jury, the right to be free of unreasonable search and seizure, nor the right to free speech and freedom of religion. (religion.blogs.cnn.com)