εὐσταθ-έω,
to be steady, stable, ὅταν πολίταις εὐσταθῶσι δαίμονες are favourable, [[ 5th c.BC: Euripides Tragicus “Rhesus” 317; εὐ. ταῖς διανοίαις 1st c.BC: Dionysius Halicarnassensis 6.51 ] Refs 5th c.BC+]; εὐστάθει rest in peace! in an epitaph, [[ “IG” 14.1464] Refs]; to be calm, tranquil, of the sea, [[ 2nd c.AD: Lucianus Sophista “VH” 1.30; οὐκ εὐ. οἱ ὄρνιθες 1st-2nd c.AD: Plutarchus Biographus et Philosophus 2.281b. ] Refs 1st c.AD+]
__2 enjoy sound, stable health, εὐ. καὶ ὑγιαίνειν [[ 4th-3rd c.BC: Epicurus Philosophus “Fragmenta” 68, compare 413, 2nd c.AD: Soranus Medicus 1.87, 3rd c.BC: Herodas Mimographus ] Refs 4th c.BC+] middle cited in [[ 4th c.AD: Oribasius Medicus 7.8.1. ] Refs 4th c.AD+]
__3 of cities or countries, enjoy tranquillity, εὐσταθοῦσα βασιλεία [[ “OGI” 56.19 (Canopus, 1st c.BC: Ptolemaeus Epigrammaticus III)] Refs 1st c.BC+]; τὴν πόλιν εὐ. [[ “SIG” 708.37 (Istropolis, 2nd c.BC),compare 2nd c.AD: Appianus Historicus “Ἰβηρική” 9. ] Refs 2nd c.BC+]