Quick Definition
ἀκατάστατος, ον Adj unsettled, unstable
Strong's Definition
from 1 (as a negative particle) and a derivative of 2525; inconstant
KJV Usage: unstable
UBS Dictionary of the Greek New Testament
adjc. | -ον | ἀ- + ἵστημι
37.32 · Control, Rule · Control, Restrain
not controlled by, not subject to, uncontrolled pertaining to being unable to be controlled by something or someone It is also possible to translate ‘it is an evil which cannot be controlled’ as ‘it is an evil which no one can control’ or ‘no one can control this evil.’
UBS Dictionary of the Greek New Testament © United Bible Societies, licensed CC BY-SA 4.0.
Thayer's Greek Lexicon
ἀκατά-στατος, -ον, (καθίστημι), unstable, inconstant, restless: «185. 1. 8, and 1, T Tr WH in iii. 8 also, but less fitly; [cf. Hermae Past. 1. ii. mand. 2, 3 πονηρὸν πνεῦμά ἐστιν ἡ καταλαλιά, καὶ ἀκατάστατον δαιμόνιον. μηδέποτε εἰρηνεῦον, ἀλλά etc.]. ([Hippoer. et al.] Polyb. 7, 4, 6, al. [Sept. Is. liv. 11].)
Mounce Concise Greek Dictionary
ἀκατάστατος akatastatos 2x
unstable, inconstant; unquiet, turbulent, Jas. 1:8; 3:8*
Abbott-Smith Greek Lexicon
ἀ-κατά-στατος, -ον
(< καθίστημι), [in LXX: Is 54:11 (סֹעֲרָה);]
unsettled, unstable: Ja 1:8, 3:8.†
Moulton & Milligan — Vocabulary of the Greek NT
ἀκατάστατος. Auaollent no. 4 (6)}}3 (a curse on a leaden tablet from Cnidus) ἀνατίθημι Δάματρι kal Κόραι τὸν τὴν οἰκία(ν) μου ἀκατά[σ]τατον ποιοῦ(ν)τα. The date (af. zt. p. 5) is given as B.C. 300-100, though the series may be later (Newton). 4 ἢ ακεραιὸς
Liddell-Scott-Jones — Greek-English Lexicon
ἀκατάστατος (akatastatos) — restless. ἀκατά-στᾰτος, ον, (καθίστημι) unstable, unsettled, καιροί[Refs 5th c.BC+]; disorderly, ὁρμαί[Refs 1st c.BC+]:—of men, fickle, [Refs 2nd c.BC+]; of fevers, irregular, [Refs 5th c.BC+]adverb -ως, ἔχειν[Refs 5th c.BC+]
II. not making any deposit, οὖρον[Refs 5th c.BC+]