The headword is a two-ending adjective in the masculine/feminine nominative singular, preumenh/s, -e/s; see generally LSJ s.v. Its principal attestations are in Attic tragedy: see e.g. Aeschylus, Persians 685 (web address 1), and Euripides, Hecuba 538 (web address 2).
[1] The gloss is of the same grammatical form as the headword; see generally LSJ s.v. pra=os, -on. The headword is similarly glossed in Etymologicum Magnum 687.1 (Kallierges) and ps.-Zonaras 1572.7; cf. Hesychius s.v. preumene/s.