precipitancy

noun

1. (countable, uncountable)Suddenness; excessive haste.

   “Though this involuntary falſehood may frequently be no mark of any want of veracity, of any want of the moſt perfect love of truth, it is always in ſome degree a mark of want of judgment, of want of memory, of improper credulity, of ſome degree of precipitancy and raſhneſs.”