丸(まる)でquite, entirely, completely, at all, as if, as though, just like

丸(まる)で夢(ゆめ)のような出来事(できごと)が起(お)きました。

It was like a dream come true.

こんな下手(へた)な歌唱(かしょう)力(りょく)ではまるで歌手(かしゅ)にはなれないよ。

With such poor singing ability, you can't become a singer at all.

兄弟(きょうだい)だが丸(まる)で違(ちが)う息子(むすこ)達(たち)を見(み)ていると興味深(きょうみぶか)い気持(きも)ちになります。

It's interesting to see my sons who are brothers but who are completely different.

予想(よそう)とはまるで違(ちが)う結果(けっか)が出(で)たが、それが実験(じっけん)の醍醐味(だいごみ)だと言(い)えるだろう。

The results were not quite as expected, but that's the best part of the experiment.

大人(おとな)になってもまるで子供(こども)のようにはしゃげるなんて、君(きみ)はピュアなんだね。

You're so pure that even as an adult you can still act like a child.