Stuned or Stained: How To spell?

The word Stuned is misspelled against Stained, which is past tense of "Stain"

Word contains consecutive vowels 'AI' in between alphabets st & ned is misspelled as 'U'
Wrong Spelling:  st-u-ned 
Correct Spelling:  st-ai-ned 
Check more misspelled words of Stained to spell it correct.

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