She was always a lightweight drinker.

The lightweight boxer won the match.

The new car was lightweight.

'Lightweight' is an adjective. If you are saying that your mouse is not heavy, you'd say "My mouse is lightweight."

When was the lightweight plow invented?

yes it is lightweight

When you finish the challenge "Lightweight Pro IV" under the "Perks" section, the perk Lightweight upgrades to Lightweight Pro. Lightweight Pro allows the player to raise their weapon more quickly after they stop sprinting.