What does 独り言 mean?
独り言 is a Japanese noun meaning “a soliloquy, a monologue, speaking to oneself” in English. It is written as 独り言 in kanji, ひとりごと in hiragana, and hitorigoto in romaji. This word is part of JLPT N2 vocabulary.
Example sentence
私は彼がぶつぶつ独り言をいうのを聞いた。
I heard him mumble to himself.