The word Underdresed is misspelled against Underdressed, an adjective meaning "Not dresses enough."
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Underdressed has double "ss" is mispronounced as "s"
Remember double 'SS' in between the strings underdre & ed which should not be misspelled with single 'S'
Wrong Spelling:  underdre-s-ed 
Correct Spelling:  underdre-ss-ed 
Explore spell check of Underdressed to spell without errors.