The opposite of swift is slow.
the opposite of slow down - fast up......heheheh lolzzz. i think that it has no opposite..even if it has a opposite then it may be - do it fast, be quick,etc
slow.
Slow
Slow.
slow down
Slow and hard.
Slow paced.
Slow Hour
The opposite of abrupt could be gradual, slow, or incremental.Calm, kind, nice...
late negligent slow tardy
Brisk.