Plural of 'drabness': multiple instances or types of dullness, dreariness, or lack of brightness.
Simple plural of 'drabness' using the standard '-es' plural suffix for nouns ending in '-ness'.
Using the plural 'drabnesses' suggests you're comparing different kinds of dreariness—like how one room's drabness differs from another's—a subtle way to show depth of observation.
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