ἔϊσος
Οὐ γὰρ ἀργίας ὤνιον ἡ ὑγίεια καὶ ἀπραξίας, ἅ γε δὴ μέγιστα κακῶν ταῖς νόσοις πρόσεστι, καὶ οὐδὲν διαφέρει τοῦ τὰ ὄμματα τῷ μὴ διαβλέπειν καὶ τὴν φωνὴν τῷ μὴ φθέγγεσθαι φυλάττοντος ὁ τὴν ὑγίειαν ἀχρηστίᾳ καὶ ἡσυχίᾳ σῴζειν οἰόμενος → For health is not to be purchased by idleness and inactivity, which are the greatest evils attendant on sickness, and the man who thinks to conserve his health by uselessness and ease does not differ from him who guards his eyes by not seeing, and his voice by not speaking
English (LSJ)
η, ον [ῑ], Ep. form of ἶσος,
A alike, equal, Hom., only fem. sg. and pl., always in set phrases (exc. [ἵππους]..σταφύλῃ ἐπὶ νῶτον ἐΐσας equal in height, Il.2.765): 1 most freq. of a feast, equal, i.e. equally shared, of which each partakes alike, esp. of sacrificial feasts or of meals given to a stranger (for on other occasions the greatest men had the best portions), δαιτὸς ἐΐσης 1.468,al. 2 ofships, even or well-balanced, νηὸς ἐΐσης 15.729; νῆες ἐῗσαι Od.5.175,al. 3 of a shield, evenly balanced, ἀσπίδα πάντοσ' ἐΐσην Il.12.294, 13.157, 160, etc. 4 of the mind, even, well-balanced, φρένας ἔνδον ἐΐσας Od. 11.337, 14.178.