Taboo
noun, verbal noun, の adjective
Prohibition of something with a punishment so serious that you'll end up in mourning after is a taboo.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
よく、禁忌を犯すと手足をもがれると言われますが、これは本当でしょうか。
It’s often said that your hands and feet are plucked off when you commit a taboo, is that true?