Henry George Liddell, Robert Scott, A Greek-English Lexicon

A.set over against, meeting, “ἵπποι ὑ. ἀλλήλοισιν” Hes.Sc. 347.

2. set against, opposite, of enemies in battle, “τοὺς σφίσιν ὑ.” Th.2.2; οἱ ὑ. the enemy, X.Cyr.1.6.38, cf. D.18.148, etc.

3. opposed, opposite, contrary, “γένη” Pl.Plt.306e; of contrary properties, “τὸ ὑ.” Hp.VM13; ὑπεναντιωτάτοις . . πλείστοις χρώμενον endued with most qualities most opposed to one another, Alex.141.2; “ἰχθῦς ὑ. αὑτοῖσι” Damox.2.37: freq. c. dat., opposite or contrary to, “ὁ ὑπεναντία τούτοισι λέξας” Hdt.7.50, cf. X.HG4.8.24 (Sup.), Pl.Tht.176a, Lg.810d, Epicur.Ep.1p.28U., Abh.Berl.Akad.1925(5).7 (Cyrene, iii B. C.), SIG 613.28 (Delph., ii B. C.), Wilcken Chr.27.1 (ii A. D.), etc.; so “ὑ. πρός τι” Arist.Pol.1328b41; “πρὸς δημοκρατίαν” IG22.657.48: as Subst., τὸ ὑ. τούτου . . πέφυκε is in character the opposite of this, Hdt.3.80; “τὰ ὑ. τούτων” on the contrary, Id.7.153; “τὰ ὑ.” incongruities, Arist.Po.1455a26, cf. 1461b23.

4. of logical propositions, subcontrary, Steph. in Int.30.38. Adv. -ίως ib.32.24.

b. Math., subcontrary, “τομή” Apollon.Perg.1.5; of a mean, Archyt.2, Papp.84.14, etc.

II. Adv. -ίως in a manner contrary to, “τοῖς νόμοις” Aeschin.3.8; ὑ. ἔχειν to be opposed, Arist.GA719a28; ὑ. κεῖσθαι ib.719b18; “περί τινα ὑ. ὑπάρχει πρός τι” Id.HA500a13, al., cf. Phld.Po.5.19; “ὑ. θεραπεύσεις” Aët.16.52: also neut. pl. ὑπεναντία as Adv., IG22.1258.8, 7.2225.36 (Thisbe, ii B. C., senatus consultum).