exacting
ascetic
grim
relentless
ruthless
rigid
stern
stringent
scrupulous
drastic
harsh
rigor
rigorous
serious
severe
austerity
ordeal
勇敢
bold
daring
undaunted
dauntless
valiant
gallant
intrepid
valor
自私
flighty
skimpy
stingy
miserly
snobbish
selfish