Ulster hooker Rory Best said he could not fault his side's effort but was left hugely disappointed to come away from Leinster with a loss.
Friday's 8-3 negative at the RDS was a hard-fought match, as both sides returned to PRO12 duty from respective Champions Cup pool defeats.
But a try from Leinster hooker Sean Cronin ultimately won the game and afterwards Best gave an honest assessment as Ulster drop to seventh.
"It is a tough one to take, to lose that game tonight," he told the Belfast News Letter.
"You can see the disappointment in the players coming off the pitch. The boys put their bodies on the line against a good Leinster side, and you can't fault and effort and application.
"I think we didn't do enough with the wind, and we played within ourselves in the first half. When we look back at it on Monday, we will be disappointed we didn't do more.
"We tried to go at them in the second half, and we looked the better team and we were enjoying it more.
"It was a game of fine margins. Leinster got an opening and they scored."
Best, however, refused to dwell too much on the loss as he highlighted his side's character which they can use to good effect in the future.
"We never want to lose or expect to lose, but I am sure there were a lot of people outside the camp who expected Leinster to run away with it in the second half – but that's not what we are about," he said.
"The boys showed a lot of character, and there is a good foundation to build on."