MOMENTOUS
momentous
(adjective) of very great significance; “deciding to drop the atom bomb was a very big decision”; “a momentous event”
Source: WordNet® 3.1
Etymology
Adjective
momentous (comparative more momentous, superlative most momentous)
Outstanding in importance, of great consequence.
Anagrams
• mesonotum
Source: Wiktionary
Mo*men"tous, a. Etym: [Cf. L. momentosus rapid, momentary.]
Definition: Of moment or consequence; very important; weighty; as, a
momentous decision; momentous affairs.
– Mo*men"tous*ly, adv.
– Mo*men"tous*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition