unreasonable
adj.adj. not fair or sensible. You use this to describe someone who asks for too much or a situation that does not follow logic.
adj. exceeding the bounds of common sense or fairness; not guided by or based on good judgment. Often used to describe demands, expectations, or prices that are excessive.
The price they are asking for the car is unreasonable.
My boss is being unreasonable by asking me to finish this entire report by tomorrow morning.
The court ruled that the search was unreasonable because the officers lacked a warrant or probable cause to enter the private residence.
From Middle English unresonable, equivalent to un- + reasonable, originally partly after Latin irratiōnābilis.
Often followed by 'to' and an infinitive ('unreasonable to expect') or 'of' when referring to a person's behavior.