Jurgen Klopp was made to pay for fielding Liverpool's youngest ever Premier League starting line-up as Swansea swept them aside to secure their own survival in England's top flight.
Klopp made eight changes from the Liverpool side beaten 1-0 by Villarreal on Thursday, sending out a team with an average age of just 23.
Afterwards the German admitted the Reds had "a bad day".
"We changed the line-up and you can see there was not the body language you need for a comeback," said Klopp.
"We deserved to lose, they deserved to win, that's how football is on a bad day."
Liverpool struggled against the pace of Andrew Ayew.
The Ghanaian scored twice, first with a powerful header from a 20th-minute corner and then with a 66th-minute shot after the Reds failed to clear their lines.
Jack Cork also found the net with a curling right-foot shot on 33 minutes.