The word Breathlesly is misspelled against Breathlessly, an adverb meaning "In a breathless manner."
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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.