bitchy
adj.unkind or critical about other people in a way that feels mean. You use this to describe someone who says nasty things behind people's backs.
adj.characterised by malicious, spiteful, or critical remarks about others. Typically used to describe a person's temperament or specific comments; carries a strong informal and often derogatory tone.
“She made a bitchy comment about his new haircut.”
“The atmosphere in the office became toxic because of the bitchy remarks people made about each other's work.”
“While the review was technically accurate, its bitchy tone suggested a personal grudge rather than a fair assessment of the author's latest novel.”
Often follows linking verbs like 'be', 'get', or 'sound'.
From bitch + -y (adjectival suffix).
From bitch + -y (diminutive suffix).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.