Bailly
ἄ·στατος, ος, ον [τᾰ] 1 instable, non fixe, incertain, ARSTT.
Metaph. 11, 8, 4 ; POL. DS. PLUT.
etc. ; 2 non pesé, NIC.
Th. 602.
Étym. ἀ, ἵστημι.
Bailly 2020 Hugo Chávez Gérard Gréco, André Charbonnet, Mark De Wilde, Bernard Maréchal & contributeurs / Licence Creative Commons Attribution - Pas d'Utilisation Commerciale - Pas de Modification — « CC BY-NC-ND 4.0 »
LSJ
ον, (< ἵσταμαι) never standing still, unresting, τὸ κύκλῳ σῶμα Arist. Metaph. 1073a31; ἄ. τροχός Mesom. Nem. 7. Adv. -τως, φορεῖθαι Ph. 1.181, cf. Vett.Val. 27.1.
unsteady, unstable, τύχη Epicur. Ep. 3 p. 65U., cf. Phld. Rh. 1.166S. (Sup.), Ph. 1.230, al., Diog.Oen. 18, Diogenian. Epicur. 2.60, Plu. 2.103f; of persons, ἄ. τὴν διάνοιαν Onos. 3.3; ἄ. αἰών IG 7.2543; θνητῶν βίος Epigr.Gr. 699, cf. Ph. 1.651; of a house, ruinous, PLond. ined. 2194.
uncertain, θεωρία Plb. 6.57.2. Act., making it impossible to stand, πόνος, πάθος, Luc. Ocyp. 36, 71.
unweighed, IG 1.32B 25, al., Nic. Th. 602.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
Pape
1) unstät, unbeständig, Sp.; θεωρία, unsicher, Pol. 6.57.
2) ungewogen, Nic. Th. 602.
Pape, Griechisch-deutsches Handwörterbuch (3. Aufl., 1914)