precipitous

done with very great haste and without due deliberation

Instead of calling his financial advisor, Harold acted precipitously, buying 4,000 shares of the latest "hot" stock, only to find out that the company had a history of inflating its year end numbers.

When I left the family home in a blaze of anger and anxiety, I took what I call precipitous action.

When I left the family home in a blaze of anger and anxiety, I took what I call precipitous action.

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