/ sɑːˈkæstɪk; NAmE sɑːrˈk-/ (also BrE informal sarky ) adjective
showing or expressing sarcasm :
sarcastic comments
a sarcastic manner
'There's no need to be sarcastic,' she said.
► sar·cas·tic·al·ly / -kli; NAmE / adverb
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WORD ORIGIN
late 17th cent.: from French sarcastique , from sarcasme (see sarcasm ), on the pattern of pairs such as enthousiasme , enthousiastique .