Dictionary entry

ἀναντίρητος

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

ἀν-αντί-ρητος

(T, -ρρητος), -ον (< ῥητός, spoken), [in Sm.: Jb 11:233:13*;]

not to be contradicted, undeniable: Ac 19:36 (MM, VGT, s.v.).†