Same entry, according to Adler, in the Ambrosian Lexicon. The headword adverb is otherwise attested -- and the glossing one is prima facie ambiguous: see LSJ s.v. a)/peiros A (inexperienced, untried, ignorant) and B (boundless, endless, infinite). Sense B will be required here, however, if (as seems very probable) the headword is connected with the verb dai/zw, "I cleave asunder" (LSJ).