irrational: can imply mental derangement, but it more often suggests lack of control by or open conflict with reason: our world which often seems ~.


unreasonalbe: is likely to suggest guidance by some force other than reason such as ambition, greed, or stubbornness that makes or shows one decifient in good sense: made ~ demands on a friend.


irrational不理性: 可表示精神错乱，但更多表示不受理性控制或与之抵触，unreasonable无合理: 被野心贪婪固执等非理性因素引导


记忆方法: 1) UI你我相处<==不能无理取闹      两个词的差异是导致非理性的原因不同，irrational原因宽泛，unreasonable常表示野心贪婪顽固等原因，语气严重一些

              2) 无理的意思是不受理性引导或无法理性思考mean not governed or guided by reason or not having the power to reason.UI你我相处<==不能无理取闹