swiftest is a form of:

Swift



adjective
1.
(~ to do something) (quick, rapid) swift boat លឿន, swift motion រហ័ស, swift to act ឆាប់
Example: She is swift to anger.
2.
(បច្ចេកទេស) លឿន, ឆាប់
ENGLISH MEANING
noun
1.
The current of a stream.
2.
Any one of numerous species of small, long-winged, insectivorous birds of the family Micropodidae. In form and habits the swifts resemble swallows, but they are destitute of complex vocal muscles and are not singing birds, but belong to a widely different group allied to the humming birds.
3.
Any one of several species of lizards, as the pine lizard.
4.
The ghost moth.
5.
A reel, or turning instrument, for winding yarn, thread, etc.; -- used chiefly in the plural.
6.
The main card cylinder of a flax-carding machine.
verb
1.
(INTRANSITIVE) Of short continuance; passing away quickly.
2.
(INTRANSITIVE) Moving a great distance in a short time; moving with celerity or velocity; fleet; rapid; quick; speedy; prompt.
1.
abrupt, expeditious, fast, fleet, quick, rapid, speedy, sudden, unexpected
1.
slow, sluggish
1.
Swiftly