严酷

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