безмятежный
From LSJ
ἀνήνεμος, νήνεμος, νηκηδής, ἀθορύβητος, ἄπονος, ἄτρομος, ὑπερβόρεος, σχολαῖος, λιπαρός, μαλακός, ἀπερίσπαστος, ἀταλάφρων, ἀπερίστατος, ἄμοχθος, ἀπήμαντος, ἀσινής, ἀσάλευτος, φανός, ἀβληχρός, γαληνός, ἕκηλος, ἕκαλος, εὔκηλος, εὔκαλος, λεῖος