Darren O'Neill felt his Belfast Star side gave an unacceptable performance, going down 87-64 to Marian in the All Ireland Superleague.
It has been a tough season for Star, but for the first time in the campaign coach O'Neill felt the level of intensity was not what should be expected.
Even American Dillon Stith seemed to leave his magical touch in the dressing room, only delivering 17 when he has been averaging 30 points a game.
"For me it was our worst performance of the season because we didn't work hard enough, there wasn't enough effort and that just isn't good enough. For whatever reason they just couldn't bring more drive to the game," said O'Neill.
"We've got a tough game away to Killester this Saturday and that has to be our focus. The guys know they have to raise their game again and I'm confident they will. There are areas we need to work on and we'll do that this week in training."
In the women's Division One, the Ulster Rockets continued their impressive season with another victory when overcoming the Huskies 62-55.