a. 苦行的, 禁欲(主义)的

ascetical \ascetical\ adj.
1. pertaining to or characteristic of an ascetic ascetical
practices

Syn: ascetic
[WordNet 1.5]

2. practicing great self-denial.

Syn: ascetic, austere, spartan
[WordNet 1.5]

Be systematically ascetic . . . do . . . something
for no other reason than that you would rather not
do it. --William
James.