"It was the most painful experience for me," Bashar who flew home after fracturing his left thumb, told Monday's edition of English daily The Star after his team suffered a 3-2 series loss against an under-strength Zimbabwe.
Bashar, 33, described the loss as "the biggest debacle in (my) career" and apologised to millions of cricket fans who had had high hopes that Bangladesh would win their first away series.
"I feel sorry for the country's cricket-mad people but I must request them to keep faith in us because ... we are an improving side," he said on Monday.
Bashar and his coach Dav Whatmore had told reporters before the team left for Harare that the team would be looking for a 5-0 whitewash against Zimbabwe, who were playing without any of their recognised cricketers.
Whatmore, who for the first time was criticised by the local media for some decisions, has admitted Zimbabwe were the better side.
"We simply were not good enough. We allowed them to win two matches as we could not sustain pressure," Whatmore told tigercricket.com, the official website of Bangladesh Cricket Board.
Bangladesh lost the five-match series with a game to play after going down in the fourth match by seven wickets at Harare on Friday. An eight-wicket victory on Sunday could only provide some solace to the visitors.
The Bangladesh team now being led by stand-in captain Khaled Masud will play a three-match one-day series against Kenya later in the week before returning home from their African safari.