lightweight
adjective
uk/ˈlaɪtweɪt/ usweighing only a little or less than average:
We shipped thousands of very lightweight cardigans for the spring season.
Composites tend to be stronger than steel but more lightweight.
lightweight plastics/carbon fibres
not showing deep understanding, knowledge, or ability:
She's the author of some fairly lightweight investing guides.
Many in the US regarded him as too lightweight to become the IMF's managing director.
lightweight
noun
uk/ˈlaɪtweɪt/ ussomeone who does not show deep understanding, knowledge, or ability:
In certain circles he has been dismissed as an intellectual lightweight.
See also
heavyweight