* Penalize means to punish someone for doing something wrong.
* Reuse means to use something again after it has been used once.
Here's why they aren't antonyms:
* Opposite meanings: They have opposite meanings and are not related in any way.
* No shared context: They don't share a common context or situation where they would be opposing forces.
Think of it this way: You might be penalized for littering, but reusing a plastic bottle has nothing to do with being punished.