“Reason” in Japanese
Short answer
Reason in Japanese is “筋道” (sujimichi). Full meaning: reason, logic; method, system, order, thread (e.g. of an argument).
Other ways to say “Reason” in Japanese
理由
riyuu reason, pretext, motive
謂れ
iware reason, cause; history, origin
理屈
rikutsu theory, reason, logic; (unreasonable) argument, strained logic, excuse, pretext
条理
jouri reason
所以
yuen reason, grounds
原由
genyu reason, cause
理性
risei reason, reasoning power, (one's) sense
事理
jiri reason, facts, propriety, sense
事由
jiyuu reason, cause
道理
douri reason, logic, sense, truth, right
訳柄
wakegara reason, circumstances, meaning
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