Synonyms and related words :
absolute, apodictic, bound, certain, clear, clear and distinct, clear as day, conclusive, decisive, definite, determinate, foreordained, forgone, ineluctable, inevitable, necessary, perfectly sure, positive, predecided, predestinate, predetermined, preordained, sure, sure-enough, TRUE, unambiguous, unequivocal, univocal, unmistakable