G4550
σαπρός
rotten
σαπρός, -ά -όν [in Sm.: Lev.27:14, 33 * ;] rotten, corrupt, bad, worthless: of trees and fruit (opposite to ἀγαθός, καλός), Mat.7:17-18 12:33 Luk.6:43; of fish, Mat.13:48. Metaphorical, in moral sense: λόγος σ., Eph.4:29. "In Hellenistic . . . it became a synonym for αἰσχρός or κακός," MM, xxii.† (AS)
The KJV translates G4550 in the following manner:
corrupt (14x), bad (2x)
Full Thayer's lexicon entry
σαπρός — saprós
σαπρός, σαπρά, σαπρόν (σήπω, 2 aorist passive σαπῆναι);
1. rotten, putrid ((Hipponax), Hippcr., Aristophanes, others).
2. corrupted by age and no lounger fit for use, worn out (Aristophanes, Dio Chr., others); hence, in general, of poor quality, bad, unfit for use, worthless (A. V. corrupt) (πᾶν, ὁ μή τήν ἰδίαν χρείαν πληροι, σαπρόν λέγομεν, Chrysostom hom. 4 on 1 Timothy): δένδρον, καρπός, opposed to καλός, Mat 7:17; Mat 12:33; Luk 6:43; fishes, Mat 13:48 (here A. V. bad); tropically, λόγος, Eph 4:29 (cf. Harless at the passage); δόγμα, Epictetus 3, 22, 61. Cf. Lob. ad Phryn., p. 377f.
6 occurrences
Matthew (4), Luke (1), Ephesians (1)