Lexical Definition

‎ἀδόκιμος‎ adókimos (ad-ok'-ee-mos) failing G:A
from ‎Α‎ (as a negative particle) and ‎δόκιμος‎

castaway, rejected, reprobate.

Usage: 6 forms in 11 verses
Form Translated As     In Verse(s)
ἀδόκιμοσ disqualified 1Cor.9.27
worthless Heb.6.8
ἀδόκιμον a depraved Rom.1.28
ἀδόκιμοι disqualified 2Tim.3.8
unapproved 2Cor.13.62Cor.13.7
unfit Titus.1.16
ἀδόκιμοί failing 2Cor.13.5
εγένετο εγένετο became LXX.1Kgs.4.31
αδόκιμον debased LXX.Isa.1.22
unproven LXX.Prov.25.4

Abbott-Smith

ἀ-δόκιμος, -ον, [in LXX: Pr 25:4, Is 1:22 (סִיג)*;]

1. of things (prop. of metals: LXX, Pr 25:4, Is 1:22), not standing the test, rejected: γῆ, He 6:8.
2. Of persons, rejected after testing, reprobate: Ro 1:28, I Co 9:27, II Co 13:5-7, II Ti 3:8, Tit 1:16 (Cremer, 212).†

Abbott-Smith References

Book Refs
Proverbs 25:4
Isaiah 1:22
Romans 1:28
1 Corinthians 9:27
2 Corinthians 13:5
2 Timothy 3:8
Titus 1:16
Hebrews 6:8

Liddell-Scott-Jones

ἀδόκιμος-ος, ον,

not legal tender, not current, of coin, [Refs 5th c.BC+]; not approved, of horses, [Refs 4th c.BC+]

__2 unsatisfactory, unconvincing, of a statement, [Refs 3rd c.BC+]
__3 disreputable, λακίσματ᾽ ἀδόκιμος ὀλβίοις ἔχειν[NT+5th c.BC+]. adverb -μως[Refs 2nd c.AD+]
__4 of persons, [Refs 5th c.BC+]; discredited, reprobate, [NT+5th c.BC+]

LSJ Scripture Refs: Rom.1.282Tim.3.8