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