Adjectives

(a)unsolved, unresolvednot solved“many crimes remain unsolved”, “many problems remain unresolved”
(s)open, undecided, undetermined, unresolvednot brought to a conclusion; subject to further thought“an open question”, “our position on this bill is still undecided”, “our lawsuit is still undetermined”
(s)unresolved, dissonantcharacterized by musical dissonance; harmonically unresolved