Undul or Undull: How To spell?

The word Undul is misspelled against Undull, a verb meaning "To remove the dullness of; to clear."

Undull has double 'll' in the end mispronounced as 'l'
Remember double 'LL' appears in the end of this word which should not be misspelled with single 'L'
Wrong Spelling:  undu-l 
Correct Spelling:  undu-ll 
Check more misspelled words of Undull to spell it correct.

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