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ἄεικτος

Φιλοκαλοῦμέν τε γὰρ μετ' εὐτελείας καὶ φιλοσοφοῦμεν ἄνευ μαλακίας -> Our love of what is beautiful does not lead to extravagance; our love of the things of the mind does not makes us soft.
Τhucydides, 2.40.1

Spanish (DGE)

-ον
inflexible, obstinado subst. τὸ ἀτενὲς καὶ ἄ. Anon.V.Thecl.12.14.