1. (adj) mordant
a substance used to treat leather or other materials before dyeing; aids in dyeing process
Antonyms: constructive, unsarcastic
2. (adj) black, grim, mordant
harshly ironic or sinister
Synonyms: blackened, dispirited, opprobrious, bootleg, black-market, disgraceful, calamitous, macabre, dismal, dark, sick, disconsolate, black, fateful, down in the mouth, unforgiving, low, smuggled, unrelenting, inglorious, stern, dim, pitch-dark, fatal, unappeasable, gruesome, ghastly, pitch-black, downhearted, grim, low-spirited, mordant, down(p), dour, downcast, contraband, erosive, shameful, disastrous, smutty, relentless, corrosive, forbidding, ignominious, sorry, vitriolic, gloomy, drab, bleak, depressed, dingy, inexorable, dreary, drear, grisly, caustic, blue, sinister
Antonyms: unsarcastic, constructive
3. (adj) caustic, corrosive, erosive, vitriolic, mordant
of a substance, especially a strong acid; capable of destroying or eating away by chemical action
Synonyms: acrid, mordant, blistering, sulphurous, sulfurous, grim, corrosive, acid, erosive, bitter, virulent, caustic, acerbic, vitriolic, black, acerb
Antonyms: constructive, unsarcastic
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Synonyms and Antonyms of mordant 
