ἀνύποπτος
From LSJ
Ἀναβάντα γὰρ εἰς τὴν ἀκρόπολιν, καὶ διὰ τὴν ὑπερβολὴν τῆς λύπης προσκόψαντα τῷ ζῆν, ἑαυτὸν κατακρημνίσαι → For he ascended the acropolis and then, because he was disgusted with life by reason of his excessive grief, cast himself down the height
English (LSJ)
ον,
A without suspicion, i.e., 1 Pass., unsuspected, Th.3.43 (Comp.), X.Cyr.5.3.11; λεηλασίαι unexpected, Arr.Tact.17. 5 Adv. -τως unsuspectedly, Aen.Tact.10.20, al., Men.666. 2 free from risk, κίνησις Sor.1.55; θάνατος Phld.Sto.Herc.339.4. 3 Act., unsuspecting, πράξεως Plb.8.27.2, Plu.Brut.8. Adv. -τως Th. 1.146; ἀ. ἔχειν Arist.Top.156b18; unhesitatingly, Plu.2.614b.