独り言

1. Origins, structure, and basic meaning

• Structure: 独り言 is read as ひとりごと and is a noun for words spoken to oneself without a conversation partner.
• Basic usage: Muttering quietly to oneself appears in 小声で独り言を漏らす, while self-talk being heard from the next room appears in 隣の部屋から独り言が聞こえる.

2. Common pitfalls and similar expressions

• Spoken object and heard subject
  • Use を when someone lets the words slip and が when the self-talk itself is heard.
• Difference from 会話
  • Unlike an exchange between two or more people, this is speech made alone without expecting a reply.