The word Diagonaly is misspelled against Diagonally, an adverb meaning "In a diagonal direction."
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Diagonally has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings diagona & y which should not be misspelled with single 'L'
Wrong Spelling:  diagona-l-y 
Correct Spelling:  diagona-ll-y 
Find more incorrect spellings of Diagonally to spell right way.