active

adjective:engaging in physically energetic pursuits
- She has always been an active person who enjoys hiking and swimming.
adjective:involved or participating in a particular activity or cause
- He is an active member of the neighborhood council.
adjective:currently operating or functioning
- The volcano is still active despite recent calm periods.
adjective:having a chemical or biological effect
- The active ingredient in the medication relieves pain.
adjective:lively and full of ideas
- That child has an active imagination.
adjective:marked by regular action or use
- He became sexually active at an early age.