One of the mysteries of the English language finally explained.
Adding -ful or -fully
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
Back to spelling.
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