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