Asceticism

noun the act of renouncing or rejecting something, self-denial

• The monk's life was characterized by a strict abnegation of worldly pleasures.
• She practiced abnegation by giving up her favorite dessert for Lent.
• Dude, that level of abnegation is just crazy!
• In order to achieve success, one must practice abnegation of distractions and focus on their goals.

noun the practice of restraining oneself from indulging in something, especially alcohol or sex

• Medical professionals often recommend abstinence from alcohol during pregnancy.
• I'm practicing abstinence from junk food this month to improve my health.
• I'm on an abstinence kick right now, trying to detox from all the partying.
• His abstinence from social media was a refreshing change, allowing him to focus on more meaningful activities.