Noninterchangeable
the GNU version of the Collaborative International Dictionary of English
adjective.
not able to be interchanged without changing the truth value.
adjective.
Not able to be substituted for each other; -- of objects, such as parts of machinery
Wiktionary, Creative Commons Attribution/Share-Alike License
adjective.
That cannot be
interchanged
with another
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
adjective.
such that the terms of an expression cannot be interchanged without changing the meaning
Word Usage
"The simplest tents have two interchangeable poles; more-complex designs have noninterchangeable poles."
Equivalent
asymmetric
asymmetrical