One of the mysteries of the English language finally explained.
1‘a caustic cleaner’
corrosive, corroding, mordant, acid, alkaline, burning, stinging, acrid, harsh, destructive
2‘a caustic comment’
sarcastic, cutting, biting, mordant, stinging, sharp, bitter, scathing, derisive, sardonic, ironic, scornful, trenchant, acerbic, vitriolic, tart, acid, pungent, acrimonious, astringent, rapier-like, razor-edged, critical, polemic, virulent, venomous, waspish
British informal sarky
rare mordacious, acidulous
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