Translation guide
To think deeply about something, often repeatedly. In Japanese, the best expression depends on whether you are reflecting carefully, worrying obsessively, or chewing cud.
To ponder or contemplate something carefully, often over a period of time.
The most direct equivalent for 'ruminate' in the sense of thinking deeply and carefully. Suitable for formal and written contexts.
He ruminated on the proposal.
A common, natural way to say 'think carefully' or 'take one's time to think'. Less formal than 熟考する.
I'll ruminate on it a bit more.
To turn over in one's mind, to ponder various aspects. Often used in literary or introspective contexts.
He ruminated about his future.
To be lost in deep thought, silently pondering. Very formal and literary.
He ruminated in silence and came up with an answer.
To repeatedly think about something negative, often in an unproductive way.
To brood or worry about something, often over minor things. Common in everyday speech.
It's no use ruminating over your mistakes.
Literally 'to chew cud', but psychologically means to ruminate or obsessively revisit thoughts. Often used in clinical or self-help contexts.
The biological process of an animal chewing partially digested food.
Directly translating 'ruminate' as 反芻する in non-technical contexts may sound odd or overly clinical. Use 熟考する or じっくり考える for general deep thinking, and くよくよ考える for brooding.
She can't help but ruminate on unpleasant memories.
To be lost in thought, often with a negative connotation of worrying or overthinking.
He was ruminating by himself.