LSJ
or (before a vowel) παντάπασιν, Adv.
all in all, altogether, wholly, πείθεσθαι Hdt. 7.152; ἱπποκρατεῖσθαι Th. 6.71; ἀπόλλυσθαι, ἄγασθαι, Pl. Phd. 88a, Lg. 631a; τὰ δίκαια π. ἀκριβῶ X. Cyr. 1.3.17; with Adjs., π. ὀλίγοι very few indeed, Pl. Plt. 293a; π. ῥᾴδιον Id. Prt. 328a; π. βλάξ quite a simpleton, X. Cyr. 1.4.12; π. ἔρημος D. 21.80; with Advbs., οὐ π. οὕτως ἀλόγως not so absolutely without reason, Th. 5.104; π. ἀνοήτως Isoc. 12.232; with the Art., τὸ π. Th. 3.87; with a neg., π. οὐδέν, οὐδὲν π., nothing at all, Anaxag. 12, Arist. GC 316a27. in affirmative answers, by all means, undoubtedly, π. μὲν οὖν Pl. Phdr. 278b, Sph. 227a; π. γε X. Mem. 4.5.3.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
od. παντάπασιν, Alles in Allem, überhaupt, gänzlich ; ἄγαμαι, Plat. Legg. I.631b ; ἀπόλλυσθαι, Phaed. 88a ; auch c. adj., ὀλίγοι, Polit. 293a ; βλάξ, Xen. Cyr. 1.4.12 ; Folgde, wie Pol. 5.34.2 ; – τὸ παντάπασι, Thuc. 3.87. – In der Antwort, gewiß, nachdrücklich bejahend, παντάπασί γε, Plat. Soph. 236a, wie Xen. Mem. 4.5.3 ; παντ. μὲν οὖν, Plat. Phaedr. 271a.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)