/ ˈlaɪtweɪt; NAmE / adjective , noun
■ adjective
1.
made of thinner material and less heavy than usual :
a lightweight jacket
2.
( disapproving ) not very serious or impressive :
a lightweight book
He was considered too lightweight for the job.
■ noun
1.
a boxer weighing between 57 and 61 kilograms, heavier than a featherweight :
a lightweight champion
2.
a person or thing that weighs less than is usual
3.
( informal , disapproving ) a person or thing of little importance or influence :
a political lightweight
He's an intellectual lightweight (= he does not think very deeply or seriously) .