The meaning of Castaway in the Bible
(From International Standard Bible Encyclopedia)

kast'-a-wa (adokimos, from dokimazo, "I test," "I approve after testing," hence, approved after being tested): This word is rendered "castaway" only in the King James Version: "I myself should be a castaway" ("rejected" the Revised Version (British and American), the American Standard Revised Version, I Corinthians 9:27). But the same word occurs a number of times usually translated "reprobate" (Romans 1:28; II Corinthians 13:5-7; II Timothy 3:8; Titus 1:16); "rejected" (Hebrews 6:8).

See more on the meaning of Castaway in the Bible:
Castaway {Easton's Bible Dictionary}

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