Why is cussing generally considered bad

It originates by way of superstition in the form of "curse" or "swear" words. People used to believe (and some still do) that certain combinations of letters or words could bring about evil spirits or bad in the world, so saying such words and phrases was frowned upon since they thought it was going to made bad things happen.

From WordNet (r) 3.0 (2006) [wn]:

cuss n 1: a persistently annoying person [syn: {pest}, {blighter}, {cuss}, {pesterer}, {gadfly}] 2: a boy or man; "that chap is your host"; "there's a fellow at the door"; "he's a likable cuss"; "he's a good bloke" [syn: {chap}, {fellow}, {feller}, {fella}, {lad}, {gent}, {blighter}, {cuss}, {bloke}] 3: profane or obscene expression usually of surprise or anger; "expletives were deleted" [syn: {curse}, {curse word}, {expletive}, {oath}, {swearing}, {swearword}, {cuss}] v 1: utter obscenities or profanities; "The drunken men were cursing loudly in the street" [syn: {curse}, {cuss}, {blaspheme}, {swear}, {imprecate}]

From Moby Thesaurus II by Grady Ward, 1.0 [moby-thesaurus]:

31 Moby Thesaurus words for "cuss": bloke, boy, buck, chap, curse, curse and swear, cuss word, damn, dirty name, dirty word, dysphemism, dysphemize, epithet, execrate, expletive, fellow, foul invective, gent, guy, he, imprecate, man, naughty word, no-no, oath, obscenity, profane oath, scatologize, swear, swearword, talk dirty

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