adj.心不在焉的;怠慢的;疏忽的
He is smart but inattentive, he sometimes fails to concentrate when he is studying. 他雖然聰明但不夠專心,學習中時常心有旁騖。
She is inattentive to her guests. 她對客人招待不周。
n.漫不經心;不注意;疏忽