What does うとうと mean?
うとうと is a Japanese adverb meaning “falling into a doze; dozing off; nodding off” in English. It is written as うとうと in hiragana, and utouto in romaji. This word is part of JLPT N1 vocabulary.
Example sentence
彼は一日中うとうとしていた。
He slumbered out the whole day.