Definition
'Unreasonable' means not guided by reason; irrational or absurd. It's like expecting your parents to buy you a car when you haven't done your chores. It is something not based on good sense. It suggests a lack of logic or fairness. Think of a teacher giving an 'unreasonable' amount of homework over the weekend. It's not fair or practical. It may also describe someone unwilling to listen to valid points. Essentially, it's defying logic.