The NKJV translation of the Greek word adokimos <1 Cor. 9:27; 2 Cor. 13:5-7; Titus 1:16>. In three other references, the NKJV translates the Greek word as debased , disapproved <2 Tim. 3:8>, and rejected . The literal sense of the word is "tested and proved to be false or unacceptable." Borrowed from the athletic games, the word describes a contestant who, because of some infraction of the rules, is disqualified from winning the prize <1 Cor. 9:27>; (castaway KJV). Another metaphor is possible: a "counterfeit faith" <2 Tim. 3:8>, (RSV). This suggests a coin that has been tested, proven false, and disapproved as legal tender.

(from Nelson's Illustrated Bible Dictionary)

(Copyright (C) 1986, Thomas Nelson Publishers)