Qu'est-ce qu'un indeterminate? Qu'est-ce qu'un indeterminate? Not precisely determined, determinable, or established: a person of indeterminate age. Not precisely fixed, as to extent, size, nature, or number: an indeterminate number of plant species in the jungle. Lacking clarity or precision, as in meaning; vague: an indeterminate turn of phrase. Not fixed or known in advance: an indeterminate future. Not leading up to a definite result or ending: an indeterminate campaign. Botany Not terminating in a flower and continuing to grow at the apex: an indeterminate inflorescence.