Synonyms of swiftness in English:

swiftness


See definition of swiftness

noun

1‘the children had the swiftness of weasels’

SYNONYMS
speed, speediness, quickness, velocity, celerity, fleetness, fastness, rapidity, rapidness, liveliness
informal nippiness
ANTONYMS

slowness, sluggishness

2‘bankruptcy can happen with surprising swiftness’

SYNONYMS
suddenness, abruptness, instantaneity, rapidity, rapidness, haste, hastiness, briskness, hurriedness, hurry

3‘the answer came with unwanted swiftness’

SYNONYMS
promptness, immediateness, immediacy, instantaneousness, rapidity, rapidness, dispatch, punctuality
alacrity, expeditiousness, readiness, willingness
ANTONYMS

lateness, tardiness