SACRAMENTO, Calif. — The Nets used words like frustrated and disappointed after their latest loss. They should have added embarrassed after this one.

Brooklyn collapsed in the fourth quarter against the woebegone Kings, blowing a lead and getting stunned 112-101 before 13,153 at Golden 1 Center.

The Nets ran their losing streak to six straight, the longest skid currently in the NBA and their worst since dropping seven in a row from Dec. 26, 2019-Jan. 7, 2020. But considering this team’s expectations, this was far more humbling — and worrying.

“It’s everything. A little bit of everything,” James Harden said. “[We have to] keep chipping away, a day at a time. That’s all you can do, come together closer, even tighter. It’s definitely frustrating. Its definitely difficult. But we’ve got to find a way to get out of it as a group.”

This ugly loss came after the Nets (29-22) had shown signs of life in tough losses at Golden State and Phoenix, the two best teams in the league. But Wednesday night, they showed precious little fight, taking an 86-83 lead into the fourth but conceding nine unanswered points to open the final period.

The Nets shot just 7-of-21 in the fourth — and 1-of-9 from deep — to get outscored 29-15. And this from a Kings team that had dropped seven straight.

“Our level of play just dropped significantly in the second half on both sides of the ball,” Steve Nash said. “We let guys beat us off the dribble at a much higher rate than we did in the first half. We just didn’t make shots, didn’t make plays and looked tired offensively.”

Nobody looked more tired than Harden. He had 12 assists, but just four points on 2-of-11 shooting. He committed six turnovers and finished a wretched minus-21.

“I thought James looked tired,” Nash said. “He didn’t have his legs. It was one of those nights.”

It was Harden’s lowest-scoring game since 2014 in which he logged at least 30 minutes. Tuesday in Phoenix had marked his return from a right hand injury, but on the tail end of this back-to-back, it was his legs that gave out.

“It’s just the reality that when you come out, some guys aren’t going to have the same legs they had the night before,” Kyrie Irving said. “That’s a factor into every ball game when you’re playing a back-to-back. You just saw we ran out of gas.”

Playing without Kevin Durant, Joe Harris and now LaMarcus Aldridge, the Nets got a career-high 23 points and 11 boards from Nic Claxton, but it wasn’t enough. The Nets have fallen from atop the East on Jan. 22 to 3½ games behind the Bulls. They’re just 1½ clear of the Hornets for the play-in.

Asked why they’ve been so wildly inconsistent, Harden said: “You know just as good as I do. We’ve just got a lot of different things internally, lineups, and we haven’t had [any] continuity yet. So it’s just one of those things where you’ve got to just keep going. Nothing else to do but keep going. Keep pushing forward.”

After the Nets trailed 23-21 on Davion Mitchell’s finger roll, they reeled off a 14-0 run that spanned into the second.

Irving’s back-to-back 3-pointers and Patty Mills’ 3 capped the run for a 35-23 cushion. But they couldn’t build on it — or in the end, even hold onto it.

James Johnson (18 points) hit a pullup to end the third to give the Nets a three-point edge going into the final period. But it didn’t last.

Brooklyn coughed up a 9-0 run, Harden’s sixth turnover leading to a Buddy Hield 3. His ensuing technical handed Hield (18 points off the bench) a free throw that made it 92-86.

The clock read 10:21 to play, but it was over.

Next up is Utah and Denver to end a grueling trip. But the Nets have no intention of calling a players only meeting.

“No, I think we’ve done too much talking,” Harden said. “We’ve got to go out there and do it, and do it consistently. We have times where we’re great; then we have times where we’re really bad. And you’ve just got to find some consistency.”