indeterminate

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"

having a capacity for continuing to grow at the apex; "an indeterminate stem"

of uncertain or ambiguous nature; "the equivocal (or indeterminate) objects painted by surrealists"

not capable of being determined; "the indeterminate number of plant species in the jungle"

not leading to a definite ending or result; "an indeterminate campaign"