non-gradable

non- +‎ gradable

non-gradable (not comparable)

1. That cannot be graded.
2. (linguistics) (of an adjective) Describing a quality that cannot normally be varied because it is extreme (e.g. freezing), absolute (e.g. dead), or classification (e.g. nuclear).

   Synonyms: ungradable, uncomparable, incomparable

   Antonym: gradable

• gradable

non-gradable (plural non-gradables)

1. (linguistics) Any adjective that is not gradable.

• “non-gradable” in the Cambridge English Dictionary, Cambridge: Cambridge University Press.
• “non-gradable” in Oxford Learner's Dictionaries
• ungradable, nongradable, uncomparable at Google Ngram Viewer
• ungradable adjectives, nongradable adjectives, uncomparable adjectives at Google Ngram Viewer