decisive, fatal, fatefulall-important, central, critical, crucial, essential, key, pivotal, seminal, vitalbig, consequential, earthshaking, earth-shattering, eventful, historic, important, major, material, meaningful, momentous, monumental, much, significant, substantial, tectonic, weightydistinctive, exceptional, impressive, outstanding, prominent, remarkablevaluable, worthwhile, worthy

inconsequential, inconsiderable, insignificant, little, minor, negligible, slight, small, trifling, trivial, unimportantpaltry, petty, worthless