I. ˈlīt-ˌwāt noun
Date: 1773
1. : one of less than average weight ; specifically : a boxer in a weight division having a maximum limit of 135 pounds for professionals and 132 pounds for amateurs — compare featherweight , welterweight
2. : one of little consequence or ability
a political lightweight
II. adjective
Date: 1809
1. : lacking in earnestness, ability, or profundity : inconsequential
a lightweight painter
a lightweight TV series
2. : having less than average weight
lightweight fabrics
3. : of, relating to, or characteristic of a lightweight
the lightweight championship