Sometimes during this wait-til-next-year season, it’s hard to judge a Knicks loss, but Sunday’s was unmistakably an embarrassing stinker. And in Tim Hardaway Jr.’s words, “It sucked.”

The Knicks heard their first boos of this developmental season when the first-quarter horror was over. It got worse as coach David Fizdale suffered his most horrific defeat since coming to New York in a 115-89 blowout to the young Magic.

“This is like the most disappointing [loss] all season,” Hardaway said after shooting 2-of-12 for seven points. “Leaving Toronto wanting to come home and knowing we don’t have a lot of home games this month, it sucked. It sucked coming out here and stinking up the Garden. We can’t let that happen again. Just can’t.”

The Knicks fell behind 10-0, didn’t score until five minutes into the contest, trailed 30-10 after one quarter and were down 33 early in the fourth period against a club that hasn’t made the playoffs since the 2011-12 season.

Playing with seemingly dead legs on the second night of a back-to-back, the Knicks shot a hideous 5-of-28 from 3-point range in falling to 4-10. The Magic moved to 6-7, but are not expected to be a playoff club.

Knicks signee Mario Hezonja, who played the last three seasons for Orlando, said he felt embarrassed getting torched by his old club.

“It hurts, terrible,’’ Hezonja said, who shot 3-of-9. “I want to congratulate them. They did an amazing job, but we just altogether were not on the same page. I know we’re the youngest team in the league, but we have to have pride and fight out there.”

It was a nightmarish evening for almost everyone in the newly unveiled “City Edition” navy uniform, but especially the starting backcourt as Hardaway struggled and Frank Ntilikina played a pitiful first six scoreless minutes before being benched for the evening.

Hardaway took ownership of the unsightly first quarter.

“I put that on myself,’’ he said. “It was my fault. I got to do better coming out of the gate. All the guys look at me at both ends. I didn’t deliver.’’

Fizdale has been light in criticizing the club, even after its 16-point loss in Toronto on Saturday, but had a little more of an edge Sunday.

“No excuses,’’ Fizdale said of playing the second leg of a back-to-back. “We’re never going to let our guys have that out. It’s the NBA…. We came out flat and they came out firing. We didn’t wake up until the second quarter and started playing the game.’’

On a rare bright note, Knicks rookie center Mitchell Robinson recorded a franchise rookie record nine blocks.

After three quarters and with the Knicks down 87-60, many fans headed for the exits and others chanted, “We Want Baker’’ in honor of out-of-the-rotation cult hero Ron Baker.

Several of the Knicks’ other losses were palatable, even that 23-point defeat in Miami. That was on the road against a playoff-caliber team. Saturday’s loss in Toronto at least was against a one-loss powerhouse.

This one was inexcusable. Fizdale was fairly giddy Saturday after the blowout loss when his team gave up 128 points, even calling himself “proud.’’ He tried calling two timeouts Sunday night to stem the first-period tide but nothing worked.

“We just didn’t give it our all tonight,’’ Hardaway said. “I hate to say it. They didn’t do nothing special.’’

Orlando was led by 22 points from hot-shooting Terrence Ross (5-of-8 from deep). In shooting 5-of-23 with eight turnovers in that opening period, the Knicks managed their fewest points in a quarter at home since 2006. The Knicks starters, who Fizdale praised as a unit he wants to keep together, combined for two points in the first quarter. Only two players scored in the period — Enes Kanter (eight) and Hardaway (two).

“We have to come together as a team,’’ Robinson said. “Communication has to be way better than what it was tonight.’’

Robinson went on to finish the night with four points, four rebounds and the nine blocks. Fellow-rookie Kevin Knox also had some life, scoring 15 points (3-of-10, 7-of-10 from the foul line).

“I need to keep an open mind and be fair,’’ Fizdale said regarding whether lineup changes are coming when they embark on a three-game road trip to Oklahoma City, New Orleans and Orlando.