also: うべ
adverb
Archaic or literary adverb expressing strong affirmation or agreement. In modern Japanese, it is mostly encountered in classical texts or fixed expressions. The word is often written in kana.
むべなるかな、彼の言う通りだ。
Indeed, it is as he says.
古語では「むべ」は「もっとも」の意味で使われた。
In classical Japanese, 'mube' was used to mean 'truly' or 'most certainly'.
Kana spelling is the most practical for modern learners, as the kanji forms are archaic.
Alternate archaic kanji spelling; even rarer than 宜.
Alternate reading; less common than むべ.
The exact derivation is uncertain; it is an old Japanese adverb that appears in classical literature. The kanji 宜 and 諾 are ateji (phonetic equivalents) used for their meanings of 'right' and 'consent', respectively.