The best replacement for impulsivity is reflectivity.

The best alternatives to impulsivity are rated as following:
★★★★★  reflectivity
★★★★  impulsiveness
★★★  compulsivity
★  sensation seeking
  reflection

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Speaking about impulsivity, one probably shouldn't forget about adhd.

Other search terms related to impulsivity and their ratings are:
★★★★★ adhd
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Google Trends

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impulsivity
reflectivity
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