indeterminate
Pronunciation: /ˌɪndɪˈtəːmɪnət/
adjective
- 1not exactly known, established, or defined: the carpet is an indeterminate dull shade the date of manufacture is indeterminate
- (of a judicial sentence) not of a fixed length but dependent on the convicted person’s conduct: the abolition of the indeterminate borstal sentence for young offenders
- Mathematics (of a quantity) having no definite or definable value.
- Medicine (of a condition) from which a diagnosis of the underlying cause cannot be made: indeterminate colitis

Origin:
early 17th century: from late Latin indeterminatus, from in- 'not' + Latin determinatus 'limited, determined' (see determinate)