Synonyms for Sarcastic:

adj.

acid (adjective)
mordant.
contemptuous (adjective)
contemptuous, sardonic, deprecative, insulting, flippant, antipathetic, scornful, jeering, mocking, disdainful, abusive, disparaging, Ridiculing, satirical, derisive, scoffing.
critical (adjective)
captious.
insolent (adjective)
brash, impertinent, audacious, cheeky, flagrant, discourteous, insubordinate, mouthy, callous, brazen, disrespectful, sacrilegious, outspoken, contemptuous, saucy, impolite, presumptuous, irreverent, rude, bold, insolent, derisive, outrageous, defiant, arrogant, candid.
nasty, mocking in speech (adjective)
contemptuous, saucy, corrosive, cynical, sharp, sardonic, disillusioned, taunting, caustic, austere, Twitting, mordant, ironical, contumelious, scornful, carping, severe, irascible, Chaffing, disparaging, disrespectful, bitter, hostile, biting, cutting, scorching, scurrilous, captious, brusque, Snarling, sneering, derisive, satirical, arrogant, acid, acrimonious, offensive.
ridiculing (adjective)
derisive.
sharp (adjective)
sharp, acrimonious.
snide (adjective)
snide.

n.

laugh, mock, jeer, custard pie, lampoon, burlesque, mockery. laughter, sneering, respect. sarcastic (noun)
black, sardonic, barbed, satiric, mordant, saturnine, pungent, wry, biting, satirical, mordacious, grim, nipping.
scornful (noun)
brusque, ironical, acid, Snarling, corrosive, scorching, cutting, disillusioned, offensive, contumelious, austere, unbelieving, severe, Scurrile, rabelaisian, Hudibrastic, Chaffing, harsh, quizzical, snide, cynical, carping, bitter, hostile, taunting, acrimonious, Snickering, irascible, caustic, captious, Twitting, sneering, pert.

Other synonyms:

sneering, carping. acid. base
snide.
biting
cutting, biting.
harsh
scorching.
sarcastic
bitter, corrosive, caustic.
sardonic
cynical.

Usage examples for sarcastic

  1. It sounded almost sarcastic – The Wooden Horse by Hugh Walpole
  2. There was a sarcastic and malicious mocking way about them that struck him from the first. – The Secret of the Night by Gaston Leroux
  3. " Don't be- don't be so sarcastic he urged; " don't be unkind, Valentine." – The King in Yellow by Robert W. Chambers