also: もにゃもにゃ
adverb, adverb taking the 'to' particle
mumbling; muttering; incomprehensibly
Mimetic word describing the sound or manner of speaking unclearly, often in one's sleep or when talking to oneself. Frequently used with 言う or 呟く.
He's mumbling something in his sleep.
He muttered something incomprehensibly.
Variant pronunciation and spelling; less common.
Katakana variant of the less common もにゃもにゃ reading.
Onomatopoeic word imitating the sound of indistinct, sleepy, or muffled speech. The exact origin is uncertain, but it is a typical reduplicative mimetic formation.