Dyskolos (Greek: Δύσκολος) or The Grouch is the most substantial surviving play by Menander, the key dramatist of the Greek New Comedy, which succeeded Aristophanes' Old Comedy and heavily influenced Roman comedy. It was originally performed at the Lenaia festival of 317 BC.
The play centres on Sostratus, a wealthy young man and his attempts to marry the daughter of Cnemon, the title character, in the face of the obstacles provided by the latter's boorish personality.
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Free online texts
Fairfield University: Menander's Dyskolos (Grouch), translated by Vincent J. Rosivach. HTML format.
Poetry in Translation: Dyskolos, translated by George Theodoridis (2013). Multiple formats.
Wikisource: Δύσκολος - Greek text.
Ancient-Literature.com: Dyskolos - synopsis and analysis.
Cornell College Classical Studies: The Comedies of Menander.
Literature and History: The New Comedy - Menander's Old Cantankerous. Podcast and transcript by Doug Metzger.
University College London: Menander's Dyskolos Study Guide - archived at the Internet Archive.
The Great Conversation: Further reading at Tom's Learning Notes
Theophrastus: On Characters
Menander: The Girl from Samos
Aelian: Epistulae Rusticae - includes letters based on the plot of the Dyskolos.
Ancient Greek resources: Learn to read Greek classics in the original.