The Gunners forward believes his side need to be more 'ugly' and 'efficient' to win games.
The Gunners were recently pegged back by Anderlecht from 3-0 down in the Champions League, before losing from a winning position at Swansea City just days later.
The north London side have since bounced back to beat Borussia Dortmund 2-0, although they were also defeated by Manchester United despite having enough chances to comfortably dispatch Louis van Gaal's side.
And Giroud admits it is a 'shame' Arsenal are not more ruthless in games.
“I think we have done well – apart from the games against Swansea and Anderlecht, maybe. I didn’t understand why sometimes we don’t know how to close the game. It’s a shame. We are ahead, we are winning, so we need to be stronger all together defensively," Giroud told Sport Magazine.
“It’s the Arsenal way. We always want more goals. I think we are nice to watch but sometimes you don’t need to be nice to see. Sometimes you have to be ugly but more efficient. Especially when you defend.”