Translation guide
The English word 'rumination' can refer to the literal digestive process of chewing cud, or to the psychological act of deep, repetitive thinking, often with a negative connotation of overthinking. This guide focuses on the psychological sense, which is more common in everyday language.
To express the act of thinking deeply about something, often in a repetitive or obsessive way, especially about problems or negative thoughts.
This is the most direct translation, literally meaning 'rumination' (as in chewing cud), but it is commonly used metaphorically for mental rumination. It is neutral in tone and can be used in both psychological and everyday contexts.
To refer to the digestive process of animals like cows bringing food back up to chew again.
反芻 (はんすう) is a more formal, neutral term that can be used in both literal and psychological contexts. くよくよ考える is specifically for negative, unproductive worrying and is more colloquial. Use 反芻 in academic or clinical settings, and くよくよ考える in everyday conversation about personal worries.
While 反芻する can be used with a direct object (〜を反芻する), it may sound unnatural in casual speech. Instead, use phrases like 〜についてくよくよ考える or 〜のことを思い悩む to express 'ruminating on something'.
He ruminated on his failure over and over.
反芻思考がうつ病の症状の一つです。
Ruminative thinking is one of the symptoms of depression.
This phrase means 'to worry or brood over something'. It carries a negative connotation of fretting or dwelling on things unproductively. Very common in spoken Japanese.
いつまでもくよくよ考えても仕方がない。
There's no point in ruminating about it forever.
Means 'to be lost in thought' or 'to ponder deeply'. It can be neutral, but often implies getting stuck in one's thoughts, similar to rumination.
彼は何かについて考え込んでいる。
He is ruminating about something.
This means 'to worry' or 'to be troubled by thoughts'. It emphasizes the emotional distress of rumination.
彼女は将来のことで思い悩んでいる。
She is ruminating about her future.
A technical term used in psychology and psychiatry for 'ruminative thinking'. It is a compound of 'rumination' and 'thinking'.
反芻思考は不安を増大させる。
Ruminative thinking increases anxiety.
The standard biological term for rumination. It can be used as a noun or a suru-verb (反芻する).
牛は反芻する動物です。
Cows are ruminant animals.
A more colloquial term meaning 'regurgitation' or 'bringing food back up', sometimes used for rumination in animals, but less precise.
牛が食べ戻しをしている。
The cow is chewing its cud.