Thoughtlessly
Part of speech: adverb
Definition: Done without thinking
Unthinkingly
Part of speech: adverb
Definition: In an unthinking manner.
Thoughtlessly as an adverb is done without thinking while Unthinkingly as an adverb is in an unthinking manner.
Part of speech: adverb
Definition: Done without thinking
Part of speech: adverb
Definition: In an unthinking manner.
We hope you now know whether to use Thoughtlessly or Unthinkingly in your sentence.