Invective (noun), from Middle English invectif, or Old French and Late Latin invectus, is an abusive, reproachful or venomous language used to express blame or censure; also, a rude expression or discourse intended to offend or hurt. Vituperation, or deeply seated ill will, vitriol. Also note: Latin invectivus (adj.), 'scolding.'
The genre of invective
The "genre of invective" or "invective (genre)" is a form of classical libel used in Greek and Roman polemical verse. The preferred literary term for invective of the Renaissance is libel.
References
Invective Wikipedia(Text) CC BY-SA