indissoluble
From Longman Dictionary of Contemporary Englishindissolublein‧dis‧so‧lu‧ble /ˌɪndɪˈsɒljəbəl◂ $ -ˈsɑː-/ adjective formal RELATIONSHIPan indissoluble relationship cannot be destroyed the indissoluble link between language and culture —indissolubly adverbOrigin indissoluble (1500-1600) Latin indissolubilis, from dissolvere; → DISSOLVE