decisively

a battle in northern France in which English longbowmen under Henry V decisively defeated a much larger French army in 1415

the battle in 1806 in which Napoleon decisively defeated the Prussians

American planes based on land and on carriers decisively defeated a Japanese fleet on its way to invade the Midway Islands

decisively surpassed by something else so as to appear to be of a lower class

Specially or decisively characteristic of a disease; indicating with certainty a disease