Lightweight adjective noun
Unimportant or insignificant.
Her idea is considered as lightweight.
Staffing is a relatively lightweight issue compared to our other problems.
A person who is incompetent, insignificant, or unimportant.
Our team don't need a lightweight like Jack. He is incapable of doing anything useful.
A person who is badly and quickly affected by alcohol.
Linda is a lightweight, so she doesn't engage in parties.
The plural form of "lightweight" is "lightweights".