The word Biterly is misspelled against Bitterly, an adverb meaning "In a bitter manner."
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Bitterly has double "tt" is mispronounced as "t"
Remember double 'TT' in between the strings bi & erly which should not be misspelled with single 'T'
Wrong Spelling:  bi-t-erly 
Correct Spelling:  bi-tt-erly 
Find more wrongly spelled words of Bitterly to spell it well.