also: まがうかたなき
noun-modifying (irregular)
unmistakable; evident; outright; authentic
Prenominal adjective meaning something is clearly and undeniably the case; often used in literary or emphatic contexts. The form まごうかたなき is the most common reading.
それはまごうかたなき事実だ。
That is an unmistakable fact.
彼の才能はまごうかたなきものだった。
His talent was evident.
紛れもない is a more common and neutral way to say 'unmistakable' or 'undeniable', while まごうかたなき is a stiffer, literary prenominal form.
From the verb 紛う (まごう, 'to be mistaken for') + 方 (かた, 'way') + なき (classical form of ない, 'not'), literally 'there is no way to mistake it'. The alternate reading まがう is a classical or dialectal variant of まごう.