noun
glaring with hatred; hateful glare
Literary and rare; describes a look of intense hatred or resentment. Often used in classical or highly formal contexts.
彼の睚眥に満ちた目つきに、周囲は凍りついた。
Everyone froze at his glare filled with hatred.
睨み is a common word for a sharp glare or stare, not necessarily filled with hatred, while 睚眥 specifically implies deep resentment.
The exact derivation is uncertain; the kanji 睚 (corner of the eye, to glare) and 眥/眦 (corner of the eye, to look askance) combine to suggest a sidelong glare of hatred.