What does 独り言 mean?
独り言 is a Japanese noun meaning “talking to oneself, soliloquy” 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.