| ̷ ̷ ̷ ̷| ̷ ̷ adjective
1. : venomously written : written with malice and spite
poison-pen brochures — J.R.Carlson
especially : written usually anonymously and with the intention of seriously harming or destroying another's reputation
writing a poison-pen letter in disguised handwriting to the police — Georg Mann
2. : marked by or given to poison-pen writing
a poison-pen writer