Meaning of “sarcastic” in the English Dictionary

"sarcastic" in British English

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sarcasticadjective

uk /sɑːˈkæs.tɪk/ us /sɑːrˈkæs.tɪk/ UK informal sarky

C2 using sarcasm:

a sarcastic comment/remark
Are you being sarcastic?
sarcastically
adverb uk /sɑːˈkæs.tɪ.kəl.i/ us /sɑːrˈkæs.tɪ.kəl.i/

"Thanks so much for your help," Tim said sarcastically.

(Definition of “sarcastic” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)