Caustic

Adjective

 * 1) Capable of burning, corroding or destroying organic tissue
 * 2)  sarcastic, sharp, bitter, cutting, biting

Noun

 * 1) Any substance or means which, applied to animal or other organic tissue, burns, corrodes, or destroys it by chemical action; an escharotic.
 * 2)  The envelope of reflected or refracted rays of light for a given surface or object.
 * 3)  The envelope of reflected or refracted rays for a given curve.
 * 4)  caustic soda

Adverbs for Caustic
bitterly; unpardonably; unreasonably; mildly; maliciously; hatefully; sharply; acrimoniously; cruelly; brutally; atrociously; resentfully; venomously; ominously; needlessly; incisively; sarcastically; ironically; cunningly; mercilessly; churlishly; unsparingly; perversely; abusively; uncivilly; intolerably; captiously; obnoxiously; unbearably; tauntingly; unwisely; malevolently; unwontedly; habitually; unwarrantably; disagreeably; unpleasantly.

Thesaurus
salty, sarcastic, sardonic, satiric, scathing, scorching, set against, severe, sharp, sinus, sore, sour, spiteful, splenetic, stabbing, stewing, stinging, strident, stringent, succinct, tart, terse, tracery, trenchant, vehement, venomous, violent, virulent, vitriolic, withering, Rabelaisian, acerb, acerbate, acerbic, acid, acidic, acidulent, acidulous, acrid, acrimonious, actual cautery, acute, amaroidal, angry, antagonistic, antipathetic, arc, asperous, astringent, belligerent, biting, bitter, bitter as gall, bow, brand, brand iron, branding iron, brisk, burning, catacaustic, catenary, cauter, cauterant, cauterizer, cautery, choleric, circle, clashing, coarse, colliding, conchoid, conflicting, corroding, corrosive, crisp, critical, crook, curl, curve, cutting, cynical, despiteful, destructive, diacaustic, discontented, double-edged, dry, edged, electrocautery, ellipse, embittered, escharotic, feeling evil, festoon, fierce, full of hate, hard, harsh, hateful, hook, hostile, hot iron, hyperbola, incisive, ironic, irritating, keen, lituus, lunar caustic, malevolent, malicious, malignant, mordacious, mordant, moxa, nose-tickling, out of humor, out of sorts, out of temper, parabola, penetrating, piercing, piquant, pithy, poignant, potential cautery, pungent, quarrelsome, radium, rancorous, rankled, repugnant, resentful, resenting, rigorous, rough,

Etymology
From the Greek καυστός:, via the Latin causticus:.

Synonyms

 * (capable of destroying tissue): acidic, biting, burning, corrosive, searing
 * (severe, sharp): bitchy, biting, catty, mordacious, nasty, sharp, spiteful

Derived terms

 * caustic curve
 * caustic potash
 * caustic soda
 * caustic surface

Derived terms

 * lunar caustic