千思万考 (せんしばんこう) Japanese meaning | KotomoraMeanings
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noun, noun or participle which takes 'suru', intransitive verb
deep meditation; mature consideration
yojijukugo (four-character idiom)
A yojijukugo meaning to think deeply and thoroughly from many angles. Often used in formal or literary contexts.
この問題は千思万考しても答えが出ない。
Even after pondering this problem from every angle, I can't find an answer.