Stuned or Stunned: How To spell?
The word Stuned is misspelled against Stunned, which is past tense of "Stun"
Stunned has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings stu & ed which should not be misspelled with single 'N'
Wrong Spelling:  stu-n-ed  Correct Spelling:  stu-nn-ed 
Check more misspelled words of Stunned to spell it correct.