[1] Both the headword and the glossing word are aorist participles in the accusative case. (The first, although in the passive voice, has the middle-voice functions of the second; cf. generally LSJ s.v. a)ntipoie/w, II.) The headword itself is in fact extracted from the Synesius quotation given; when giving it, the Suda wrongly converts the participle from singular to plural (and replaces sou= "you" with ou) "not").
[2] Synesius, Letters 116 (p.255d Hercher). In the translation of A. Fitzgerald: "For since I first made a claim on you, it is right that I should at once accord you a favor which you desire."
[3] Polybius 2.47.5-6 (web address 1), abridged and modified -- the latter accidentally, it would seem: the original has e.g. "friendly or hostile" for the tautological "inimical or hostile", and genitive plural tw=n ei)rhme/nwn basile/wn has replaced accusative singular to\n ei)rhme/non basile/a.
[4] A paraphrase of Xenophon, Anabasis 2.3.23. See web address 2.
[5] Quotation unidentifiable.