Snarky vs. Sarcastic

Some have questioned whether snarky is a real word. There can be no doubt that it is; the adjective has been recorded in English since 1906. Its original meaning, “crotchety, snappish,” has largely been overtaken, however, by the far more frequently-encountered sense “sarcastic, impertinent or irreverent.”The precise difference between utterances described as sarcastic and snarky will vary somewhat based on the individual using each word. Some feel that sarcastic usually implies irony, or stating the opposite of what is really intended (for example, “thank you so much for your promptness” spoken to someone who arrives late), whereas snarky implies simple impertinence or irreverence (as when Downton Abbey's Dowager Countess asks Isobel Crawley, “does it ever get cold on the moral high ground?”)