Synonyms of unrelated

2 Syllables
flip-side
3 Syllables
mismatched, incongruous, tangential, extraneous, mismated, flipside, different, unlike
4 Syllables
irrelevant, nongermane, romanesque, disconsonant, contradistinct, unsimilar, unattached, dissimilar, disharmonious, unconnected, isolated, separate, violative, opposite, unalike
5 Syllables
inappropriate, inapplicable, irrelative, heterogeneous, unassociated
6 Syllables
contradistinctive, unassimilable