After arguably their worst loss of the season Monday, Knicks coach Jeff Hornacek lowered the boom, delivering his most damning assessment of his team’s defensive woes, admitting perhaps this roster is “not capable’’ of playing better defense.

It used to be the Knicks couldn’t beat the winning teams. Now they can’t beat anybody and Hornacek’s frustration bubbled over after their fifth straight loss — a 115-103 crusher to Orlando at the Garden to drop them into 10th place.

Ten days ago, the Knicks ripped the Magic at the Garden but that team has gone missing along with its defense, which allowed Orlando to shoot 15-of-31 from the 3-point line.

“I don’t think our guys aren’t trying — maybe they’re not capable,’’ Hornacek said. “I don’t know. That’s what we have to figure out. Maybe play some other guys and mix the lineup somehow.

“We have to find someone to play some defense. You can’t come out at the beginning and their first three baskets are 3s. You have to have better pride than that. … I think they’re trying — they must not be good enough defensively.’’

Hornacek suggested the coaching staff may need to come up with new, tricky schemes to compensate.

“We might figure out ways to trap,’’ Hornacek said. “Coaches are going to have to meet and try to figure it out, defensively, what is going to help us out.’’

The Knicks defense ranks sixth-worst in the NBA and turned a career reserve Jodie Meeks into James Harden Lite as the Magic (16-20) cruised all night. In losing eight of their last 10, the Knicks have dropped to two games under .500 at 16-18.

Playing on a sore left knee, Carmelo Anthony was sluggish on both ends, continuing a recent slump and finished with 19 points on 6-of-17 shooting.