the GNU version of the Collaborative International Dictionary of English
adj. Not determinable; indeterminable.
The Century Dictionary and Cyclopedia
Indeterminable.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adj. not capable of being definitely decided or ascertained
Word Usage
"Van Valkenburgh has described the landscape architect’s goal as “a combination of understanding the things that are givens and then setting it up in a way so that the occurrence of the undeterminable is a welcome consequence.”"