drab (adj.)

1715, "yellowish-gray; of the color of natural, undyed cloth," from the trade name for the color itself (1680s), which is from an earlier noun drab, drap meaning "thick, woolen cloth of a yellowish-gray color" (1540s), from French drap "cloth, piece of cloth" (see drape (v.)). The figurative sense of "dull, not bright or colorful" is by 1880.

Apparently this word is not related to earlier noun drab "a dirty, untidy woman" (1510s), "a prostitute" (1520s), which might be from Irish drabog, Gaelic drabag "dirty woman," or perhaps it is connected with Dutch and Low German drabbe "dirt;" compare drabble. The notion seems to be of dabbling in the wet and mud.

The meaning "small, petty debt" (the sense in dribs and drabs) is by 1828, of uncertain connection to the other senses.

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Definitions of drab
drab (adj.)
lacking in liveliness or charm or surprise;
her drab personality
life was drab compared with the more exciting life style overseas
Synonyms: dreary
drab (adj.)
lacking brightness or color; dull;
drab faded curtains
Synonyms: sober / somber / sombre
drab (adj.)
of a light brownish green color;
Synonyms: olive-drab
drab (adj.)
causing dejection;
Synonyms: blue / dark / dingy / disconsolate / dismal / gloomy / grim / sorry / drear / dreary
drab (n.)
a dull greyish to yellowish or light olive brown;
Synonyms: olive drab