LSJ
or οὐπώποτε, Dor. οὐπώποκα Epich. 170.1, never yet ai any time, Hom. and Att., mostly with past tenses; with pres. only Od. 12.98; with fut. only in late authors, Men. Prot. p. 94 D. ; with γάρ inserted, οὐ γὰρ πώποτε Il. 1.154, 3.442, etc.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)