Wiktionary
unpremeditatedly
adv. In a unpremeditated manner; without prior planning.
Usage examples of "unpremeditatedly".
Will had often met this situation when being unpremeditatedly pert to the great.
He heard the swish of a sam's passage and suddenly, unpremeditatedly called out, "What is going on?
A feeling of contempt and liking combine very naturally in the mind of one to whom another has just spoken unpremeditatedly, revealing rather more of his private feelings than he intended to reveal.