通とおり一いっ遍ぺん

noun which may take the genitive case particle 'no', na-adjective, noun

perfunctory; superficial; conventional

Describes actions, remarks, or attitudes that are done merely as a formality, without sincerity or depth. Often used for greetings, compliments, or routine interactions.

• 彼かれの挨あい拶さつは通とおり一いっ遍ぺんで、心こころがこもっていなかった。

  His greeting was perfunctory and lacked sincerity.

• 通とおり一いっ遍ぺんの返へん事じしかしなかった。

  I only gave a cursory reply.

noun which may take the genitive case particle 'no', na-adjective, noun

chance; transient; stray

Used for people one encounters by chance, such as a casual customer or a passerby, implying a fleeting or superficial relationship.

• 通とおり一いっ遍ぺんの客きゃくではなく、常じょう連れんになってほしい。

  I want you to become a regular, not just a chance customer.