Rigorously abstinent is a term used to describe someone who practices asceticism, which is the practice of self-denial and abstinence from worldly pleasures. Asceticism is often associated with religious or spiritual beliefs, and those who practice it are known as ascetics. The two crossword solutions for this term are ASCETIC (7 letters) and ASCETICAL (9 letters). Both words refer to someone who practices asceticism and is rigorously abstinent.