noun, na-adjective
perfectly reasonable; standing to reason
Emphasizes that something is entirely consistent with reason or logic; often used in formal or emphatic contexts.
彼の主張は道理至極だ。
His argument is perfectly reasonable.
道理至極な判断を下した。
They made a decision that stands to reason.
Compound of 道理 (reason, logic) and 至極 (extremely, most). The exact historical derivation is uncertain, but the combination yields the meaning 'extremely reasonable' or 'perfectly consistent with reason'.