not if but when Antonyms

unverifiable unforeseeable uncaused transformable risky riskful resistible random quicksilver vibratory vicissitudinary unpersuaded stoppable randomized off and on nonmandatory multivariate avertable vicissitudinous preventable permutable pensile evitable escapable driftless destinal commutative changeful avoidable avertible fitful fluctuant oscillatory noways nevermore negatory indemonstrable incertain incalculable horsefly arrhythmic