(いちいち)

いちいち
adverb
one by one; every single
1. one by one; individually; every single
Doing something for each item or instance separately, often with a nuance of it being tedious or unnecessary.
一々(いちいち)確認(かくにん)する。
I check each one individually.
一々(いちいち)説明(せつめい)しなくてもわかる。
I understand without having to explain every single thing.
そんなこと一々(いちいち)()にしないで。
Don't worry about every little thing like that.

一々(いちいち) often carries a negative nuance of being tedious or excessive.

COMMON PATTERNS:

  • 一々(いちいち)確認(かくにん)する: to check each one
  • 一々(いちいち)説明(せつめい)する: to explain every detail
  • 一々(いちいち)()にする: to worry about every little thing
  • 一々(いちいち)反応(はんのう)する: to react to every single thing

NUANCE:
When used critically, it suggests that someone is being overly meticulous or bothering with unnecessary details. In neutral usage, it simply means doing something item by item.