Noun which may take the genitive case particle 'no', Na-adjective (keiyodoshi), Noun
perfunctory; cursory; passing; conventional; formal (greetings, compliments, etc.); casual (acquaintance, remark, etc.); superficial; insincere
chance (e.g. customer); transient; stray
Also written 通りいっぺん【とおりいっぺん】