Definition of unadaptable
: not adaptable: such as
a
: not capable of adjusting to new conditions or situations
people who are unadaptable to change
b
: not capable of being easily modified to suit other conditions, needs, or uses
An economy that is … unadaptable is not efficient.— Jane Jacobs an unadaptable computer system
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Merriam-Webster unabridged
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Time Traveler for unadaptable
The first known use of unadaptable was in 1882
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