noun which may take the genitive case particle 'no', na-adjective, noun
Rare term, typically used in negative sentences to mean 'not ordinary' or 'not average'. Often appears as 並一通りではない or 並一通りでない.
His talent is not ordinary.
The scene had a beauty that was not average.
並大抵 is a more common word meaning 'ordinary' or 'average', often used in negative sentences like 並大抵ではない. 並一通り is rarer and more literary.
Compound of 並 (なみ, 'average') and 一通り (ひととおり, 'generally'). The exact historical derivation is uncertain; it is a rare literary expression.