Quick Definition
not ceasing from, not abandoning
Strong's Definition
unrefraining
Derivation: from G1 (Α) (as a negative particle) and a derivative of G2664 (καταπαύω);
KJV Usage: that cannot cease
Thayer's Greek Lexicon
ἀκατάπαστος, found only in 2Pe_2:14 in manuscripts A and B, from which L WH Tr marginal reading have adopted it instead of the Rec. ἀκαταπαύστους, which see It may be derived from πατέομαι, perfect πεπάσμαι, to taste, eat; whence ἀκατάπαστος insatiable. In secular writings κατάπαστος (which Alexander Buttmann (1873) conjectures may have been the original reading) signifies besprinkled, soiled, from καταπάσσω to besprinkle. For a fuller discussion of this various reading see Buttmann, 65 (57) (and WH's Appendix, p. 170).
STRONGS NT 180: ἀκατάπαυστοςἀκατάπαυστος, (καταπαύω), unable to stop, unceasing; passively, not quieted, that cannot be quieted; with the genitive of thing (on which cf Winer's Grammar, § 30, 4), 2Pe_2:14 (R G T Tr txt) (eyes not quieted with sin, namely, which they commit with adulterous look). (Polybius, Diodorus, Josephus, Plutarch)
Mounce Concise Greek Dictionary
ἀκατάπαυστος akatapaustos 1x
also spelled ἀκατάπαστος , which cannot be restrained from a thing, unceasing, 2Pe_2:14
Abbott-Smith Greek Lexicon
*† ἀκατάπαυστος , -ον
( < καταπαύω ),
that cannot cease, not to be re\-strained: c . gen . rei , 2Pe_2:14 , T , Tr . txt .†
*† ἀκατάπαστος
( v. Mayor , 2 Pe, cxcvii; WH , App ., 170; MM . VGT , s.v. ), -ον ,
a form otherwise unknown, prob. colloq. for -παυστος ( q.v. ): 2Pe_2:14 , L , Tr . mg ., WH .†
Moulton & Milligan — Vocabulary of the Greek NT
ἀκατάπαστος [page 17]
For the genitive construction after this neuter adjective in 2Pe_2:14 ἀκαταπάστονς ἁμαρτίας , cf. such examples from the papyri as P Tebt I. 124 26 ( c. B.C. 118) ἀσυκοφαντή (τους ) καὶ ἀδιστάστους ὄντος πάσης αἰ [τ ]ίας , BGU III. 970 7 f. (A.D. 177) τῆς εἰς ἅπαντας εὐεργεσίας . . . ἀβοήθητος : see Proleg. p. 235. In view of the common vulgar change of αυ to ᾱ (as in Ἄγουστος , ἀτός , etc. see Proleg. p. 47) it is not improbable that ἀκατάπαυστος may be the word intended, so that the mass of the MSS. have glossed correctly. Prof. Thumb suggests that the influence of ἐπάην may have affected the form. For this word cf. PSI 28 52 (iii/iv A.D. magic) ἔρωτι ἀκαταπαύστῳ .
Liddell-Scott — Intermediate Greek Lexicon
ἀκατάπαυστος [Etym: καταπαύομαι] "that cannot cease from τινός" NTest.
STEPBible — Tyndale Abridged Greek Lexicon
ἀκατάπαυστος, -ον
(καταπαύω),
that cannot cease, not to be restrained: with genitive of thing(s), 2Pe.2:14, T, Tr. txt.†
(AS)