Etymology
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scabrous (adj.)

1570s, "harsh, unmusical" (implied in scabrously), from Late Latin scabrosus "rough," from Latin scaber "rough, scaly," related to scabere "to scratch, scrape" (from PIE *(s)kep- "to cut, scrape, hack;" see scabies).

The sense in English evolved to "vulgar" (by 1881), "squalid" (by 1939), and "nasty, repulsive" (by 1951). The etmological sense of "rough, rugged, having little sharp points" is attested in English from 1650s. Related: Scabrousness.

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Definitions of scabrous

scabrous (adj.)
rough to the touch; covered with scales or scurf;
Synonyms: lepidote / leprose / scaly / scurfy
scabrous (adj.)
dealing with salacious or indecent material;
a scabrous novel
From wordnet.princeton.edu