Full of gloom; very dark, depressing, or melancholy.
Combination of 'gloom' (darkness, melancholy) with '-ful' (full of), creating an adjective meaning 'full of gloom,' likely from 18th or 19th century literary English.
Gothic novelists and Romantic poets loved words like 'gloomful' because they could paint detailed emotional landscapes—it sounds more elaborate and literary than just saying 'dark' or 'sad.'
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