憎気 is read as にくげ (nikuge) and means hateful.
にくげ
nikuge
ぞうお
hatred
にくむ
to hate
にくい
hateful
にくみあい
mutual hatred
にくみあう
to hate each other
にくしみあう
にくまれっこ
hated child
にくまれっこよにはばかる
ill weeds grow apace
にくからずおもう
to feel affectionate towards
ぞうおひょうげん
hate speech
にくまれぐち
abusive language
にくまれやく
thankless role