Bailly
ἀπ·εννέπω, v. ἀπενέπω.
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LSJ
Trag. word, also ἀπενέπω (only lyr. E. IA 552), forbid; abs., A. Th. 1058, E. Ph. 1657; ἀ. τι forbid it, S. OC 209; more freq. c. acc. et inf., ἀ. τινὰ ποιεῖν E. Med. 813, Heracl. 556; ἀ. τινὰ μὴ ποιεῖν Id. Ion 1282, HF 1295; ἀ. τινὰ θαλάμων order him from the chamber, Id. IA 552 (lyr.). c. acc. rei, deprecate, ἀνδροκμῆτας δ’… ἀπεννέπω τύχας A. Eu. 957 (lyr.).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)