Unascertainable
The Century Dictionary and Cyclopedia
Not capable of being ascertained; incapable of being certainly known.
Wiktionary, Creative Commons Attribution/Share-Alike License
adjective.
That cannot be
ascertained
;
uncertain
, unable to be
determined
or
discovered
.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adjective.
not able to be ascertained; resisting discovery