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. 他虽然聪明但不够专心，学习中时常心有旁骛。
She is inattentive to her guests. 她对客人招待不周。
n.漫不经心；不注意；疏忽
