sin pensárselo dos veces

= without a second thought, spur-of-the-moment, on the spur of the moment, at the drop of a hat

Ex. The worst interruptions of all, in my experience, come from those public address systems rigged in many schools in every room and used apparently without a second thought by administrative staff.

Ex. According to their friends, the couple made a spur-of-the-moment decision to tie the knot during a holiday.

Ex. The classic form of April fool hoax is to present an improbable situation in such a convincing way that people fall for it on the spur of the moment but later cannot understand why they did so.

Ex. Sometimes these tantrums start at the drop of a hat for often no apparent reason other than the fact that he's 2 years old.

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= without a second thought, spur-of-the-moment, on the spur of the moment, at the drop of a hat

Ex: The worst interruptions of all, in my experience, come from those public address systems rigged in many schools in every room and used apparently without a second thought by administrative staff.

Ex: According to their friends, the couple made a spur-of-the-moment decision to tie the knot during a holiday.

Ex: The classic form of April fool hoax is to present an improbable situation in such a convincing way that people fall for it on the spur of the moment but later cannot understand why they did so.

Ex: Sometimes these tantrums start at the drop of a hat for often no apparent reason other than the fact that he's 2 years old.