Khloe Kardashian is losing her patience with Scott Disick.
In a preview for Sunday's episode of Keeping Up With the Kardashians, Khloe doesn't hold back on her feelings on Scott's "negative" attitude, complaining to her sisters, Kim and Kourtney Kardashian.
"The most negative, depressed, victim," Khloe says about his demeanor at a recent family dinner celebrating the birthday of their late father, Robert Kardashian. "He acts like he tries so hard to play it straight for even a month."
WATCH: Khloe Kardashian Stuns in Skintight Latex Dress During Scott Disick's Vegas Birthday Party
"But, like, he comes and plays this victim. 'I lost my family, you guys gave up on me,'" she continues. "How are you trying? I was like, 'Scott, I want to punch you in your f*cking jugular because of your depressed, negative energy.'"
Khloe says that Scott continuously asks how he can get Kourtney back, but clearly, she's run out of sympathy.
"'Scott, you're not trying at all,'" the 31-year-old reality star says she replies back.
Kourtney and Scott's on-again, off-again relationship has been well-documented on KUWTK. Last month, Kourtney expressed disappointment at Scott during another drama-filled episode, when she discovered that he had been spending several days hanging out and partying with her younger sister Kylie Jenner's now ex-boyfriend, rapper Tyga.
"There's definitely some times when he'll take a few steps forwards and then a few steps backwards," Kourtney told cameras. "It’s just, like, this cycle that has been going on for years. That's why I finally had to step out of it."
In the same episode, Scott expressed definite regret about his split from Kourtney.
"I feel like you always kinda learn your lesson when things have already passed, and it's too late," Scott admitted. "I wasn't really around for a little bit for everybody, and you know, it's disappointing and hurtful to myself, but I'm trying to make up for it."
"Kourtney will always be a huge motivation in my life," he added. "I mean, no matter whether we're together or not, she still was with me for 10 years, and we've been through a lot of things together. In the back of my mind, Kourtney's always there, so all I can do is hope one day things fall into place, and [I'll] be able to raise my kids together with her. But at the end of the day, I still love Kourtney and that's what's important to me, and it always will be."
KUWTK airs Sundays at 9 p.m. ET/PT on E!
WATCH: Kourtney Kardashian Gets Upset With Scott Disick for Not Attending Kanye West's Show -- 'He Always Has a Million Excuses'
Scott, of course, is still notably close to the Kardashians. Last Friday, he celebrated his 33rd birthday with both Kourtney and Khloe by his side at 1OAK nightclub inside The Mirage Hotel & Casino, in Las Vegas.
According to an eyewitness, Scott and Kourtney were whispering to each other inside their booth, and he also exchanged a lot of laughs with Khloe.