Resembling or having the quality of drab; dull, dingy, or lacking in brightness (variant or informal form of 'drab').
From 'drab' plus the diminutive or familiar suffix '-y', used informally or dialectally to mean 'somewhat like drab' or emphasizing the drab quality.
Drabby sounds more informal and almost affectionate than 'drab'—it's the kind of word people might use in dialect to mean 'pleasantly muted' rather than severely depressing.
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