spontaneous

自発的な、思いつきの

計画や指示によらず、その時に自分がしたいと思って行う。

やさしい英語で： Done because you want to at that moment, without planning it or being told to do it.

• We took a spontaneous trip.
• Her spontaneous offer to help surprised me.
• He's usually careful, but today he felt spontaneous.

類義語： unplanned, impulsive, unprompted

反対語： planned

よく使う表現： spontaneous decision, spontaneous trip, spontaneous offer

自然発生的な、自発的な

外からの働きかけや原因がなく、ひとりでに起こる。

やさしい英語で： Happening by itself, without being caused or encouraged by someone or something else.

• The patient made a spontaneous recovery.
• The fire was caused by spontaneous combustion.
• Their laughter was a spontaneous response to the surprise.

類義語： unprompted, self-generated

反対語： induced

よく使う表現： spontaneous recovery, spontaneous combustion, spontaneous reaction

突然の、予期しない

前触れがなく、急に起こる。

やさしい英語で： Happening suddenly, with no warning beforehand.

• A spontaneous cheer broke the silence.
• Her words brought a spontaneous burst of laughter.
• The speech ended with spontaneous applause.

類義語： sudden, unexpected

反対語： expected

よく使う表現： spontaneous outburst, spontaneous applause, spontaneous burst

偶発的な、無作為の

決まった順序や予測できる規則がなく、偶然に起こる。

やさしい英語で： Happening by chance, without a fixed or predictable order.

• The pattern showed spontaneous changes.
• Spontaneous events disrupted the regular sequence.
• The model allows spontaneous variation at random intervals.

類義語： random, unpredictable

反対語： predictable

よく使う表現： spontaneous changes, spontaneous events, spontaneous variation

自生の、野生の

人が植えたり世話をしたりせず、その場所に自然に育つ。

やさしい英語で： Growing naturally in a place without being planted or cared for by people.

• Spontaneous vegetation covered the abandoned field.
• The survey recorded spontaneous plants beside the road.
• We left the spontaneous growth untouched.

類義語： wild, uncultivated

反対語： cultivated

よく使う表現： spontaneous vegetation, spontaneous growth, spontaneous plants