Incorrect spelling, explanation: to create this adjective we have to add a suffix -ful to a verb. The suffix is spelled with just one l at the end, which may not be obvious. This is why usefull is an incorrect spelling and the correct form is useful – with one consonant l.
Correct spelling, explanation: adjective-creating suffix -ful gives the meaning of full of, characterized by, and is always spelled with one l. This may not be obvious since it’s a different spelling from the word full. Thus useful will also be written with just one consonant l. Usefull is the wrong form.
Definition of useful:
adjective, being convenient, advantageous
My new kitchen supplies are so useful, I love them.
Why do you always buy these unnecessary gadgets? They aren’t useful at all.
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Very good to get to know that.
Great spelling site! This is the kind of help that should be shared around the net. Shame on the search engines for not displaying this English dictionary higher.