London: Arsenal's hopes of ending the top four in the Premier League are another blow as goalkeeper John Fleck later found a crucial point for Sheffield United in their 1-1 draw at the Emirates.
Gabriel Martinelli filled the void left by Pierre-Emerick Aubameyang, who opened the scoring for the Gunners at the start of the first half.
But Mikel Arteta's men found no motivation for much of the game and provided one moment of solid defense as Fleck surpassed Bernd Leno eight minutes later.
Arsenal have lost just one of their six games since Arteta took over, but they have won just one of their five Premier League games, 10 points below the top of the table.
The visitors are still four points ahead of the Gunners, moving to central Europe, seventh in the table.
A good start to the Community showed why they are above all expectations of returning to the top flight.
However, their lack of completeness was highlighted as Lys Mousset twice headed the good chances in the first 10 minutes before Arsenal calm down.
Martinelli made an impressive impact in his first season in England and the 18-year-old was Arsenal's biggest threat to Aubameyang's absence.
In the first attack, Alexandre Lacazette fed Nicolas Pepe at high speed and a Ivorian ball hit Martinelli, who was able to secure the net.
The Gunners had a big bank deal with Pepe when they paid Lille a record £ 72m for his services in August, but his confidence increased as Martinelli's every game was scored.
Martinelli was not given an easy run for the third time just seconds before half-time as Bukayo's Saka cross made it hard on his way to score his ninth goal of the season.
"Gabi will be a famous star," tweeted Aubameyang on his Twitter account. The purpose is not, because of nature, energy and mind.
Opportunities were scarce after the break as Arsenal seemed to stop the Bavaria host after being threatened.
Oli McBurnie saw a header cleared by Granit Xhaka before the Scottish striker turned Leno's head straight from another corner.
However, Sheffield United's home about a year ago I looga unbeaten home visits to Liverpool and Manchester City away during the holidays and showed resilience on the road to claim a point 7 minutes from time.
Arsenal did not make a deep cross into their box and fell to Fleck, who found the ball on the net to keep the net and saw it leap from Leno's strong shot.
Chris Wilder's men could even take all three points in the closing stages as McBurnie and Fleck had bravely shot in the box a minute from time.
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