casually

adverb

in an unconcerned manner
平気で
- glanced casually at the headlines
  偶然ヘッドラインに目を通した
not methodically or according to plan
整然としていない、あるいは計画に沿っていない
- he dealt with his course work casually
  彼は学習過程に無造作に取り組んだ

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