Synonyms of 'swiftness'
The secrecy and swiftness of the invasion shocked and amazed army officers.
With incredible swiftness she ran down the passage.
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If you do something with alacrity, you do it quickly and eagerly.
As you can imagine, I accepted with alacrity.
rapidity; swiftness; speed
Thesaurus for swiftness from the Collins English Thesaurus