Strong's Concordance

Original word: ἀναντίῤῥητος
Transliteration: anantirrétos
Definition (short): facts
Definition (full): not to be contradicted

NAS Exhaustive Concordance

Word Origin: from alpha (as a neg. prefix), anti and rhétos (stated, specified)
Definition: not to be contradicted
NASB Translation: undeniable facts (1).
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Strong's Exhaustive Concordance

From a (as a negative particle) and a presumed derivative of a compound of anti and rheo; indisputable -- cannot be spoken against.

see GREEK a

see GREEK anti

see GREEK rheo

KJV: Seeing then that these things cannot be spoken against, ye ought to be quiet, and to do nothing rashly.
NASB: "So, since these are undeniable facts, you ought to keep calm and to do nothing rash.