Lightweight

01 n. One of less than average weight;

1.
One of less than average weight;
2.
A person of small importance or mental ability, especially one who is unimportant but cheeky and presumptuous.[Colloq., Chiefly U. S.]
3.
a wrestler who weighs 139-154 pounds.

Syn. whippersnapper, jackanapes.

02 a. Light in weight, as a coin; specif., applied to a man or animal who is a lightweight.

1.
Light in weight, as a coin; specif., applied to a man or animal who is a lightweight.
2.
made of thin cloth, of relatively little weight; -- of clothing or fabrics; as, lightweight fabrics.