The word Monumentaly is misspelled against Monumentally, an adverb meaning "By means of monuments."
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Monumentally has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings monumenta & y which should not be misspelled with single 'L'
Wrong Spelling:  monumenta-l-y 
Correct Spelling:  monumenta-ll-y 
Check more misspelled words of Monumentally to spell it correct.