Stuning or Stunning: How To spell?
The word Stuning is misspelled against Stunning, an adjective meaning "Overpowering consciousness; overpowering the senses; especially, overpowering the sense of hearing; confounding with noise."
Stunning has double "nn" is mispronounced as "n"Remember double 'NN' in between the strings stu & ing which should not be misspelled with single 'N'
Wrong Spelling:  stu-n-ing  Correct Spelling:  stu-nn-ing 
Check more misspelled words of Stunning to spell it correct.