Quick Definition
unsteady, unstable
Strong's Definition
unfixed, i.e. (figuratively) vacillating
Derivation: from G1 (Α) (as a negative particle) and a presumed derivative of G4741 (στηρίζω);
KJV Usage: unstable
Thayer's Greek Lexicon
ἀστήρικτος, ἀστηρικτον (στηρίζω), unstable, unsteadfast: 2Pe_2:14; 2Pe_3:16. (Anthol. Pal. 6, 203, 11.)
Mounce Concise Greek Dictionary
ἀστήρικτος astēriktos 2x
not made firm; unsettled, unstable, unsteady, 2Pe_2:14 ; 2Pe_3:16
Abbott-Smith Greek Lexicon
*† ἀ -στήρικτος , -ον
( < στηρίζω ),
unstable, unsettled : 2Pe_2:14 ; 2Pe_3:16 .†
Moulton & Milligan — Vocabulary of the Greek NT
ἀστήρικτος [page 87]
Mayor (on 2Pe_2:14 ) cites Longinus ii. 2, ἀστήρικτα καὶ ἀνερμάτιστα unstable and unballasted (Roberts) : this should be added to Grimm s Anthology citation. We do not trouble much about vernacular warrant for words in 2 Pet. It occurs six times in Vettius Valens, in the phrase ἀ . λογισμοῦ unstable in judgement.
Liddell-Scott — Intermediate Greek Lexicon
ἀστήρικτος [Etym: στηρίζω] "not steady, unstable", Anth. , NTest.
STEPBible — Tyndale Abridged Greek Lexicon
ἀ-στήρικτος, -ον
(στηρίζω),
unstable, unsettled: 2Pe.2:14 3:16.†
(AS)