Horizontaly or Horizontally: How To spell?
The word Horizontaly is misspelled against Horizontally, an adverb meaning "In a horizontal direction or position; on a level; as, moving horizontally."
Horizontally has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings horizonta & y which should not be misspelled with single 'L'
Wrong Spelling:  horizonta-l-y  Correct Spelling:  horizonta-ll-y 
Find more incorrect spellings of Horizontally to spell right way.