General opposites:
* Diligent: This word emphasizes hard work and conscientiousness.
* Industrious: This word describes someone who is active and productive.
* Energetic: This word emphasizes having a lot of physical and mental energy.
* Active: This word indicates someone who is involved and engaged.
* Hardworking: This is a straightforward description of someone who puts in effort.
More specific opposites, depending on the context:
* Motivated: If the lazy person lacks motivation, the opposite would be someone who is motivated.
* Ambitious: If the lazy person lacks ambition, the opposite would be someone who is ambitious.
* Efficient: If the lazy person is inefficient, the opposite would be someone who is efficient.
* Productive: If the lazy person is unproductive, the opposite would be someone who is productive.
* Driven: If the lazy person lacks drive, the opposite would be someone who is driven.
The best word to use will depend on the specific situation and the nuance you want to convey.