noun, な adjective
Humility is heavy, so it's best nobody knows your secret. You should be discreet instead.
This is a jukugo word that uses the on'yomi readings of the kanji. You just need to remember the alternative reading for 重. If you aren't discreet or careful, the evil Mrs. Chou (ちょう)will find you and kill you!
What makes you so careful?