Meaning & use
Fastly
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Quickly or rapidly (a nonstandard adverb form; "fast" itself is the standard adverb, as in "run fast").
See it in a sentence
Nonstandard usage: "He walked fastly down the hall" — standard English prefers "He walked fast" or "He walked quickly."
Many English learners mistakenly say "fastly" instead of "fast" when they mean to speak quickly.
A note on using this word
"Fastly" was used in Old and Middle English but dropped out of standard usage; modern English uses "fast" itself as the adverb, making "fastly" a common learner's error today.
Words with a similar meaning
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