Indeterminate (adjective)

1. Not precisely determined or established; uncertain.
2. Not capable of being determined or resolved; indefinite.

Origin:

Late 16th century: from latin indeterminatus, from in- 'not' + determinatus 'determined', past participle of determinare.

Examples:

1. The outcome of the election was still indeterminate as the votes were being counted.
2. The indeterminate answer left many questions unanswered.
3. The indeterminate time frame made it difficult to plan.
4. The indeterminate variable caused the calculation to be incorrect.
5. The indeterminate factor made the outcome unpredictable.