敢為 is read as かんい (kani) and means daring.
かんい
kani
かんぜん
boldly
あえて
definitely not
かんこう
decisive action
かんとう
fighting bravely
こうい
act
ため
affecting
むさくい
random
むい
idleness
じんい
human work
さくい
commission (of a crime)
きふこうい
deed of endowment or donation
ふさくい
forbearance