Etymology
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scratchy (adj.)

1710, "affected with 'the scratch,'" a skin disease (a sense now obsolete), from scratch (n.1) + -y (2). In reference to pen- or brush-work, "composed of scratches," by 1827, hence "ragged, rough, irregular." The sense of "grating" is by 1866. Of sounds (especially in recorded reproduction) by 1889. Related: Scratchiness.

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Definitions of scratchy

scratchy (adj.)
causing abrasion;
Synonyms: abrasive
scratchy (adj.)
lacking consistency;
Synonyms: spotty / uneven
scratchy (adj.)
unpleasantly harsh or grating in sound;
Synonyms: grating / gravelly / rasping / raspy / rough
From wordnet.princeton.edu