incidental

certain, destined, expected, fixed, foreordained, foreseeable, foreseen, inevitable, predestined, predetermined, predictable, preordained, prescribed, sure

conscious, freewill, knowing, unforced, voluntary, volunteer, willful (or wilful)

decisive, fatal, fateful

chief, dominant, overbearing, overmastering, overriding, principal

distinctive, exceptional, impressive, outstanding, prominent, remarkable

valuable, worthwhile, worthy

distinguished, eminent, great, illustrious, preeminent, prestigious

famous, notorious, renowned

all-important, basic, essential, fundamental, key