Indeterminate means not known or decided. When someone contracts a rare stomach parasite but has not been traveling internationally, you might say it had indeterminate origins.
It's important to distinguish indeterminate from undetermined, which means not yet decided. When you buy an antique vase and don't know when it dates from, you might describe it as of an indeterminate era. If you are traveling and don't know when you plan to return home, you could say that your return is as yet undetermined.
adj not precisely determined or established; not fixed or known in advance
not established beyond doubt; still undecided or unknown
not conclusive; not putting an end to doubt or question
not capable of being definitely decided or ascertained
determining payment based on the actual cost of production plus an agreed-upon fee or rate of profit
allowing for a spontaneous response
adj not capable of being determined
adj having a capacity for continuing to grow at the apex
having stalked flowers along an elongated stem that continue to open in succession from below as the stem continues to grow