West Indies' 379-run loss to Australia was the team's most disappointing defeat, captain Shivnarine Chanderpaul said.
West Indies have suffered bigger defeats during their dramatic fall from grace over the past decade but Chanderpaul said he could not remember a time when they had crumbled so easily.
"It's probably the worst [defeat] we've had so far," he said.
"Everybody came into this game full of confidence, everybody expected us to do well and everybody's disappointed with our performance.
"On a good batting wicket with our batting line-up, we should have got some more runs on the board."
Chanderpaul, who made scores of two and seven in Sunday's match, said everyone had to accept responsibility for the defeat.
None of the four tearaway fast bowlers made any impact on the Australians, with the possible exception of Corey Collymore who took four first-innings wickets, and none of the senior batsmen made a significant score.
Brian Lara made 30 and 14, Ramnaresh Sarwan scored 21 and 31 and Chris Gayle hit 10 and 33 with Devon Smith's first-innings effort of 88 more than double the next best score.
"Our bowlers, they're young and inexperienced but I think they need to stick to the plan," Chanderpaul said.
"And whenever Brian or Chris Gayle or myself get out it's a big blow for us so hopefully one of us can get a start and carry on in the next Test."
Chanderpaul said he has not given up hope that the West Indies could produce a better performance in the remaining two Tests but said they would have to improve their attitude.
"We need to pick ourselves up and just go out there in the next game," he said.
"Guys just have to keep their heads up because we know we can do it but it's all up to us now."
