betwixt and between (adjective) debatable: controversial
Sinonime: bite the dust, buy the farm, cash in one's chips, cease living, croak, die, expire, kick off, kick the bucket, meet one's maker, pass on, push up daisies, succumb
Antonime: certain, inarguable,
incontrovertible, indubious, questionable,
sure, uncontestable, undoubted