undetermined

adjectives

not yet having been ascertained or determined
"of undetermined species"
antonym
is similar to
not explained
"accomplished by some unexplained process"
not precisely determined or established; not fixed or known in advance
"of indeterminate age"; "a zillion is a large indeterminate number"; "an indeterminate point of law"; "the influence of environment is indeterminate"; "an indeterminate future"
not brought to a conclusion; subject to further thought
"an open question"; "our position on this bill is still undecided"; "our lawsuit is still undetermined"