"ABSTINENT"

ABSTINENT
(Adjective)
Meaning:

• Refraining from indulgence, especially from the indulgence of appetite; abstemious; continent; temperate

• Voluntarily not doing something, especially something pleasant that is bad for you or has a bad reputation. (see image though the person not doing it voluntarily ...the doctor have the key to keep him abstinent from sex...)
  

Root : Middle English, from Old French abstenance, from Latin abstinentia, from abstinns, abstinent-, present participle of abstinre, to hold back;