Reason

"Reason" in Japanese

原因

gen'in

(that which causes: a cause)

思慮

shiryo

((the capacity of the human mind for) rational thinking)

理性

risei

((the capacity of the human mind for) rational thinking)

理由

riyū

(that which causes: a cause)

理由

riyū

(motive for an action or determination)

理致

richi

((the capacity of the human mind for) rational thinking)

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.