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