Romans 1:28ἀδόκιμον
Furthermore, since they did not see fit to acknowledge God, He gave them up to a depraved mind, to do what ought not to be done.
1 Corinthians 9:27ἀδόκιμος
No, I discipline my body and make it my slave, so that after I have preached to others, I myself will not be disqualified.
2 Corinthians 13:6ἀδόκιμοι
And I hope you will realize that we have not failed the test.
2 Timothy 3:8ἀδόκιμοι
Just as Jannes and Jambres opposed Moses, so also these men oppose the truth. They are depraved in mind and disqualified from the faith.
Titus 1:16ἀδόκιμοι¶
They profess to know God, but by their actions they deny Him. They are detestable, disobedient, and unfit for any good deed.
Hebrews 6:8ἀδόκιμος
But land that produces thorns and thistles is worthless, and its curse is imminent. In the end it will be burned.

Abbott-Smith

ἀ-δόκιμος, -ον,
[in LXX: Pro.25:4, Isa.1:22 (סִיג) * ;]

1. of things (prop. of metals: LXX, ll. with), not standing the test, rejected: γῆ, Heb.6:8.

2. Of persons, rejected after testing, reprobate: Rom.1:28, 1Co.9:27, 2Co.13:5-7, 2Ti.3:8, Tit.1:16 (Cremer, 212).
† (AS)

Sources: Abbott-Smith’s Manual Greek Lexicon of the New Testament (1922, public domain) and glosses from STEPBible TBESG (CC BY 4.0); STEPBible TAGNT (Greek New Testament, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.