没頭ぼっとう Common Noun Irregular Intransitive English jmdict 1 noun (common) (futsuumeishi) noun or participle which takes the aux. verb suru intransitive verb immersing oneself in;being absorbed in;devoting oneself to;giving oneself up entirely to 彼はわれを忘れて研究に没頭した。 He lost himself in his studies.