没頭（ぼっとう、boっtou）
- absorption

The Japanese word 没頭 (ぼっとう) means to be absorbed in, to be engrossed in, to be completely immersed in something, or to be lost in something. It describes a state of intense focus and dedication to an activity or subject, where one’s attention is fully consumed, and other distractions are disregarded. It implies a sense of deep engagement and often implies a positive connotation, suggesting enjoyment or passion. The action of 没頭 can be applied to various activities, such as work, hobbies, studies, or creative pursuits.

⚫︎彼は研究に没頭］している。 Translation: He is absorbed in his research. ⚫︎彼女は音楽に没頭］して時間を忘れた。 Translation: She was so engrossed in music that she forgot the time. ⚫︎子供たちはゲームに没頭］している。 Translation: The children are absorbed in the game.

You can use 没頭 in various situations to describe someone's intense focus and engagement. ⚫︎It is suitable when talking about someone diligently working on a project. ⚫︎It can be used to describe someone enjoying a hobby with great passion. ⚫︎It can be used to describe the state of getting lost in a creative task like writing, drawing, or playing music. You would typically use it to describe the subject being 没頭 in something with the particle に.

没頭 is typically written in kanji as 没頭, but can also be written in hiragana as ぼっとう. There are no variations in the okurigana.

⚫︎熱中（ねっちゅう）: Enthusiasm, passion. This synonym emphasizes enthusiasm. ⚫︎夢中（むちゅう）: Being absorbed, being in a trance. This synonym also indicates being lost in something, but it can sometimes have a slightly negative connotation, as in being oblivious to surroundings. ⚫︎集中（しゅうちゅう）: Concentration, focus. This emphasizes the act of concentrating. ⚫︎没入（ぼつにゅう）: Immersion, to be plunged into. This has a very similar meaning to 没頭.

⚫︎退屈（たいくつ）: Boredom, being bored. This is the opposite of being engaged. ⚫︎無関心（むかんしん）: Apathy, indifference. This is the opposite of having interest. ⚫︎気が散る（きがちる）: To be distracted. This represents the opposite of focus.

彼は新しいプロジェクトに没頭］し、夜遅くまで働いた。 ・Translation: He was absorbed in his new project and worked until late at night. ・Explanation: This sentence describes someone dedicating their time and effort to a project.

彼女は小説を読むことに没頭］し、周りの音に気づかなかった。 ・Translation: She was engrossed in reading the novel and didn't notice the sounds around her. ・Explanation: This sentence illustrates a state of deep concentration and detachment from the surroundings.

没頭 is a compound word. The first kanji 没 (ぼつ) means "to sink, to be immersed, to be lost." The second kanji 頭 (とう) means "head." Combining these two suggests immersing one's "head" or mind completely in something, hence the meaning of being absorbed or engrossed.