Discreet
Careful
noun, な adjective
しんちょう
慎む （つつしむ） To Be Discreet, To Be Careful
慎重 （しんちょう） Discreet, Careful
重鎮 （じゅうちん） Leader, Authority
The person who wrote "Humility is heavy" in the WaniKani mnemonic thought Humility means Humiliation. See definitions.
Your shins しん will get bruised by Mrs. Chou ちょう if you're not Discreet and Careful.