serious of import chief principal great consequential measurable importance grave distinguished primal crucial all-important heavy beta primary burning significant essential valuable Copernican main historic weighty central fundamental alpha master most-valuable strategic grand all important eventful key outstanding big in-chief of the essence grievous cardinal

proud arrogant chesty

all important of import crucial important of the essence essential

impressive

of import meaningful world-shattering probatory large probative prodigious remarkable evidentiary significant epoch-making portentous earthshaking fundamental world-shaking epochal momentous evidential operative significance noteworthy profound monumental

life-or-death polar critical essential decisive crucial pivotal life-and-death

influential authoritative

immodest