Meaning

adjective dignified and somber in manner or character and committed to keeping promises

adjective causing fear or anxiety by threatening great harm

adjective of great gravity or crucial import; requiring serious thought

originEtymology tree English grave Proto-Indo-European *-yōs Proto-Indo-European *-tHós Proto-Indo-European *-istHos Proto-Germanic *-istaz Proto-West Germanic *-ist Old English -est Middle English -est English -est English gravest From grave + -est.

Etymology from Wiktionary, CC BY-SA 3.0