Wiktionary
unadaptable
a. Not adaptable.
WordNet
unadaptable
adj. not adaptable [ant: adaptable]
Usage examples of "unadaptable".
I replied that no considerate God would destroy the human mind by making it so rigid and unadaptable as to depend upon one book, the Bible, for all the answers.
The faded photos, in stiff, wooden frames upon the chimney-piece, among them that of the fragile little woman with the unadaptable lungs.
The drawing-room was small, and hopelessly unadaptable to our purposes, with a blank wall at one end and a fireplace at the other.
Dane, that your protosaurian giants were not sapient, they had small brains and being unadaptable to changes in climate and planetary ecology, they became extinct.