Quick Definition
indisputable, not to be contradicted
Strong's Definition
indisputable
Derivation: from G1 (Α) (as a negative particle) and a presumed derivative of a compound of G473 (ἀντί) and G4483 (ῥέω);
KJV Usage: cannot be spoken against
Thayer's Greek Lexicon
ἀναντίρρητος (WH ἀναντιρητος; see Rho), ἀναντιρρητον, (the alpha privative, ἀντί, and ῤητός from Ρ᾽ΑΩ to say), not contradicted and not to be contradicted; undeniable (not to be gainsaid); in the latter sense, Act_19:36. (Occasionally in Greek writings from Polybius down.)
Mounce Concise Greek Dictionary
ἀναντίρρητος anantirrēto s 1x
not to be contradicted, indisputable, Act_19:36
Abbott-Smith Greek Lexicon
† ἀν -αντί -ρητος
(Τ , -ρρητος , -ον ( < ῥητός , spoken),
[in Sm .: Job_11:2 ; Job_33:13 * ;]
not to be contradicted, undeniable: Act_19:36 ( MM , VGT , s.v. ).†
Moulton & Milligan — Vocabulary of the Greek NT
ἀναντίρητος (~ἀναντίρρητος ) [page 36]
So spelt in OG1S 335 .138 (Pergamon, ii/i B.C.), with the meaning beyond possibility of dispute, as in Act_19:36 . Grimm notes that the word begins in Polybius, where the active sense of Act_10:29 is also paralleled : so in xxiii. 8 11 , where Schweighδuser renders summo cunctorum consensu.
STEPBible — Tyndale Abridged Greek Lexicon
ἀν-αντί-ρητος
(Τ, -ρρητος, -ον (ῥητός, spoken), [in Sm.: Job.11:2 33:13 * ;]
not to be contradicted, undeniable: Act.19:36 (MM, VGT, see word).†
(AS)