Strong's:λοίδορος abusive, i.e. a blackguardDerivation: from λοιδός (mischief);KJV Usage: railer, reviler.
TBESG:λοίδοροςrevilerG:N-M λοίδορος, -ον [in LXX: Refs Pro.25:24 26:21 27:15 (מִדְיָן) Sir.23:8 * ;] railing, abusive; as subst., ὁ λ., a railer: Refs 1Co.5:11 6:10.† (AS)
λοίδορος loidoros loy'-dor-os From λοιδός loidos (mischief); abusive, that is, a black guardKJV Usage: railer, reviler.
λοιδορία loidoria loy-dor-ee'-ah From G3060; slander or vituperationKJV Usage: railing, reproach [-fully].