WordNet sense 1 (clearly defined or formulated):

definitive

WordNet sense 2 (precisely and clearly expressed or readily observable; leaving nothing to implication):

explicit, expressed

WordNet sense 3 (free from ambiguity):

straightforward

WordNet sense 4 (expressing finality with no implication of possible change):

absolute

WordNet sense 5 (admitting of no doubt or misunderstanding; having only one meaning or interpretation and leading to only one conclusion):

unambiguous, univocal