Superlative form of 'gloomy'—the most dark, sad, or depressing.
The superlative form of 'gloomy,' using the '-est' suffix to indicate the highest degree of the quality among all things being compared.
The superlative '-est' comes from Old English and creates some of our most emphatic descriptors—'gloomiest' doesn't just mean dark, it means the absolute darkest, the most depressing of all.
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