Tragedy ???.

The greatest tragedians of antiquity were the fifth-century Greek poets Aeschylus, Sophocles, and Euripides.

Avoid the vulgar habit of referring to every sad event as a "tragedy."

From the Guide to Literary Terms by Jack Lynch.
Please send comments to Jack Lynch.
Note: This guide is still in the early stages of development.
Three question marks mean I have to write more on the subject. Bear with me.