nontonic
/ˌnɑnˈtɑnɪk/
adjective
- Not serving to invigorate, stimulate, or restore energy or health.
- The spa offered a nontonic massage that focused on relaxation rather than energy boost.
- Unlike coffee, this drink is nontonic and won't keep you awake at night.
- The doctor recommended a nontonic herbal tea for patients who are sensitive to stimulants.
Antonyms