2 occurrences in 2 dictionaries

Reference: Castaway

Easton

Gr. adokimos, (1Co 9:27), one regarded as unworthy (R.V., "rejected"); elsewhere rendered "reprobate" (2Ti 3:8, etc.); "rejected" (Heb 6:8, etc.).

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Morish

????????. Paul kept his body under control, lest, though he had preached to others, he himself should be a castaway. 1Co 9:27. The same word is translated 'reprobate' in Ro 1:28; 2Co 13:5-7; 2Ti 3:8; Tit 1:16; and 'rejected' in Heb 6:8. It is the negative form of 'approved,' Ro 16:10; etc.

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