i-adjective
perfectly round; perfectly circular
Emphasizes a shape that is completely round, like a ball or a full moon. Often used in casual or descriptive contexts.
真ん丸い月が空に浮かんでいた。
A perfectly round moon was floating in the sky.
この子の顔は真ん丸いね。
This child's face is perfectly round, isn't it?
Standard kanji-kana mixed spelling.
Common variant with kana for the first character.
Rare variant; kana for first character and 円 for second.
Rare variant using 円 instead of 丸.
丸い means 'round' in general, while 真ん丸い emphasizes a perfect, complete roundness.
Formed by adding the intensifying prefix 真ん (man) to 丸い (marui, 'round'), yielding a meaning of 'perfectly round'.