Detraction & Railing
In other words, is it
backbiting/detraction (detractio)"the blackening of another's good name by words uttered in secret"—St. Albert the Great, Sum. Theol. II 117, quoted in St. Thomas Aquinas, Summa Theologica II-II q. 73 a. 1 arg. 1
railing/reviling (contumelia)the same, but done openly, to his face (ibid.)
to call someone ...
Paul is quite specific as to how sin entered our own sphere of existence :
... by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned: [Romans 5:12, KJV.]
In this particular place he attributes the entrance of sin, into our own realm, to one man. The text you quote in I Timothy enlarges on that ...