As an adjective inacceptable
is unacceptable.
As a noun inacceptability is
the property of being inacceptable.
inacceptable
English
Synonyms
* unacceptable (more common)
Antonyms
* acceptable
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inacceptability
English
Noun
(-)
The property of being inacceptable.
Usage notes
The more common forms are unacceptable and unacceptability.