Healthy means being physically well and free from illness or injury. A healthy person has energy, their body works properly, and they don't feel sick. You know you're healthy when you can run around at recess, focus on your schoolwork, and wake up feeling ready for the day.

Healthy also describes relationships, environments, and attitudes that function well. A healthy friendship is one where people treat each other with kindness and respect. A healthy forest has thriving plants and animals living in balance. A healthy attitude means approaching challenges with confidence rather than constant worry.

Staying healthy involves taking care of yourself: eating nutritious food, getting enough sleep, exercising regularly, and avoiding things that harm your body. But it also means paying attention to your mind and emotions. Someone might look physically healthy but feel overwhelmed by stress or sadness, which affects their overall well-being.

The word can also describe reasonable amounts or portions. If you have a healthy respect for something, like the ocean's power, you take it seriously without being paralyzed by fear. A healthy appetite means you're hungry enough to enjoy a good meal. When something grows by a healthy margin, it increases by a significant and positive amount.