noun, noun or participle which takes 'suru', transitive verb
Rare literary term for deep-seated jealousy or envy tinged with suspicion and ill will. Often used in formal or written contexts. Can also function as a suru-verb meaning 'to be jealous/envious of and detest'.
彼の成功に対する猜忌の念を隠せなかった。
He could not hide his jealous resentment toward his rival's success.
猜忌の心は人間関係を壊す。
A heart full of jealous suspicion destroys relationships.