Gradable adjectives
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Adjectives describe qualities (characteristics) of nouns.

Some qualities can vary in intensity or grade (for example: rather hot, hot, very hot; hot, hotter, the hottest).

The adjective hot is gradable.

Other qualities cannot vary in intensity or grade because they are:

extremes (for example: freezing)

absolutes (for example: dead)

classifying (for example: nuclear)

The adjectives freezing, dead and nuclear are non-gradable.