The Black Cats went down 3-0 to Arsenal at the Emirates on Saturday, with Viktor Gyokeres coming off the bench to score a second half double for the league leaders after Martin Zubimendi had given Mikel Arteta's side the lead just before the break.
The scoreline was harsh on Sunderland, who limited and frustrated Arsenal up until Zubimendi's fine opener.
Sunderland pushed for a leveller after the interval before Gyokeres was introduced and sealed the points for the Gunners.
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"It was relentless," said Le Bris, whose side dropped to ninth in the Premier League table ahead of the evening kick-off.
"We showed character and personality with and without the ball. It was the game we expected.
"We knew Arsenal were really well rounded and have the ability to be impactful from set-pieces and especially after the counter press. We lost two balls and conceded two goals.
"It doesn't mean our game wasn't good. Especially at the beginning of the second half we had a couple of opportunities to be back in the game.
"We didn't seize those opportunities and against an opponent like Arsenal if you don't seize those few opportunities, the game is gone."
Le Bris was understandably frustrated with the timing of the first goal, with Sunderland coming so close to reaching half-time still level.
But he says it's important the Black Cats look at the bigger picture after a defeat to a side who are now nine points clear at the top of the Premier League.
"It [the opening goal] was an important moment for them, but our reaction was good," said Le Bris.
"I was happy with that and with the quality of our football.
"We are still a newly promoted side against maybe the best team in Europe at the minute.
"They've built this team over many years. We're not at the same stage and we have to take the lesson. It's important to build on strong foundations and improve those details."