backbite

This term carries a strong negative connotation, implying a breach of trust and a lack of courage. It describes a specific type of betrayal where the criticism is intentionally hidden from the target, contrasting with open confrontation or honest critique.

In modern usage, the word is less common than synonyms like "badmouth" or "speak ill of," often appearing in more formal or literary contexts. It suggests a repetitive or habitual pattern of malicious gossip rather than a single isolated comment.