--> Infinitesimally has double "ll" is mispronounced as "l"
Remember double 'LL' in between the strings infinitesima & y which should not be misspelled with single 'L'
Wrong Spelling:  infinitesima-l-y 
Correct Spelling:  infinitesima-ll-y 
Find more wrongly spelled words of Infinitesimally to spell it well.