indeterminate

adjective

1. not precisely determined or established; not fixed or known in advance"of indeterminate age"
2. having a capacity for continuing to grow at the apex"an indeterminate stem"
3. of uncertain or ambiguous nature"the equivocal (or indeterminate) objects painted by surrealists"
4. (of a quantity) having no definite value, as an equation that cannot be solved"0/0 is an indeterminate form"
5. not leading to a definite ending or result"an indeterminate campaign"