Breathlesly or Breathlessly: How To spell?
The word Breathlesly is misspelled against Breathlessly, an adverb meaning "In a breathless manner."
Breathlessly has double "ss" is mispronounced as "s"Remember double 'SS' in between the strings breathle & ly which should not be misspelled with single 'S'
Wrong Spelling:  breathle-s-ly  Correct Spelling:  breathle-ss-ly 
Explore spell check of Breathlessly to spell without errors.