Wilful or Willful: How To spell?
The word Wilful is misspelled against Willful, an adjective meaning "Governed by the will without yielding to reason; obstinate; perverse; inflexible; stubborn; refractory; as, a willful man or horse."
Willful has double "ll" is mispronounced as "l"Remember double 'LL' in between the strings wi & ful which should not be misspelled with single 'L'
Wrong Spelling:  wi-l-ful  Correct Spelling:  wi-ll-ful 
Check more misspelled words of Willful to spell it correct.