Tranquillized or Tranquilliized: How To spell?

The word Tranquillized is misspelled against Tranquilliized, which is past tense of "Tranquillize"

Tranquilliized has double "ii" is mispronounced as "i"
Remember double 'II' in between the strings tranquill & zed which should not be misspelled with single 'I'
Wrong Spelling:  tranquill-i-zed 
Correct Spelling:  tranquill-ii-zed 
Check more misspelled words of Tranquilliized to spell it correct.