Lexical Definition

‎σαπρός‎ saprós (sap-ros') rotten ^G:A
from ‎σήπω‎

bad, corrupt.

• rotten, i.e. worthless (literally or morally)

Abbott-Smith

** σαπρός, -ά -όν [in Sm.: Le 27:14, 33 * ;]
rotten, corrupt, bad, worth­less: of trees and fruit (opp. to ἀγαθός, καλός), Mt 7:17, 18 12:33 Lk 6:43; of fish, Mt 13:48.
Metaph., in moral sense: λόγος σ., Eph 4:29. "In Hellenistic . . . it became a synonym for αἰσχρός or κακός," MM, xxii.†

Abbott-Smith References

Liddell-Scott-Jones

σαπρός, ά, όν,

(σήπω) rotten, putrid, [Refs 6th c.BC+]; of the lungs, diseased, [Refs]; of bone, carious, [Refs]; of wood, etc., rotten, ἱστίον [Refs 5th c.BC+]; πινακίσκος, φορμός, σχοινίον, [Refs 4th c.BC+]; τοῦ διατειχίσματος ἀνελόντι τὰ σ. [Refs]; of a house, σ. καὶ ῥέουσα καὶ καταπίπτουσα Telesp.27 H.; ἐλαῖαι [Refs 6th c.BC+]: especially, of fish that have been long in pickle, stale, rancid, τάριχος [Refs 5th c.BC+]; opposed to πρόσφατος, [Refs 4th c.BC+]; of withered flowers, [Refs 4th c.BC+] adverb, -ρῶς λούει τὰ βαλανεῖα so as to leave one filthy, [Refs 2nd c.AD+]

__II generally, stale, worn out, ἀρχαῖον καὶ σαπρόν [Refs 5th c.BC+]; of clothes, [Refs 2nd c.AD+] adverb, -ῶς (perhaps misspelt for -ός) περιπατῶ I am walking about in rags, [Refs 2nd c.AD+]
__II.2 of persons, γέρων ὢν καὶ σ. [Refs 5th c.BC+]; ὦ σαπρά, to an old woman, [Refs 5th c.BC+]; οὐδέν ἐσμεν οἱ σ. [Refs 5th c.BC+]
__II.3 of wine, mellow (compare σαπρίας), [Refs 5th c.BC+]; of old wine, ὀδόντας οὐκ ἔχων, ἤδη σαπρὸς.., γέρων γε δαιμονίως [Refs 2nd c.AD+]
__II.4 εἰρήνη σαπρά, a joke παρὰ προσδοκίαν, [Refs 5th c.BC+]
__II.5 metaphorically, unsound, bad, λόγος [NT]; opposed to καλός, [Refs 2nd c.AD+]; ἄρουραι [Refs 2nd c.AD+]; τὰ σ. ταῦτα [Refs 1st c.AD+]; τὴν σ. εἱμαρμένην the evil fate, [Refs]
__III of sound, αὐλεῖ γὰρ σαπρὰ.. κρουμάτια [Refs 5th c.BC+]

_{LSJ Scripture Refs: Eph.4.29}