(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).
That cannot be graded.
noun
Any adjective that is not gradable.
unordinary
adj
Not ordinary.
How often have the words non-gradable and unordinary occurred in a corpus of books? (source: Google Ngram Viewer )