From BiblePortal Wikipedia

Vine's Expository Dictionary of NT Words [1]

1: Ὑβριστής (Strong'S #5197 — Noun Masculine — hubristes — hoo-bris-tace' )

"violent, injurious, insolent," is rendered "insolent" in  Romans 1:30 , RV (AV, "despiteful"). See Despiteful , Injurious.

Webster's Dictionary [2]

(1): ( a.) Deviating from that which is customary; novel; strange; unusual.

(2): ( a.) Haughty and contemptuous or brutal in behavior or language; overbearing; domineering; grossly rude or disrespectful; saucy; as, an insolent master; an insolent servant.

(3): ( a.) Proceeding from or characterized by insolence; insulting; as, insolent words or behavior.