How to add "-ful" or "-fully" to a word

The suffix -ful can form nouns or adjectives, like plateful or cheerful. People sometimes make the mistake of spelling this type of word with a double l at the end. Note that it’s always spelled with just one -l:

dreadful, faithful, skilful, powerful

cupful, mouthful, spoonfuls

The related ending –fully forms adverbs. Remember that this suffix is always spelled with two l’s:

dreadfully, faithfully, skilfully, powerfully

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