I'm a sucker for Japanese/South Korean horror, so I hope you don't mind subtitles, but I'll add a Western one into the lot (respect the dates because remakes are always worse):
One Missed Call (2003) will give you nightmares.
The Wailing (2016) will fuck you up emotionally (plus the story is top notch).
Martyrs (2008) is straight up painful, scary in it's own right and possibly the most disturbing "good" film I've ever seen.
Shutter (2004) will, again, give you nightmares.
Ju-On: The Grudge (2003) for well-known reasons.
Mandy (2018) is an A-class action-horror with Nicholas Cage fighting nether-hellish demons who killed his wife.
I have The Wailing in my watch queue but I think it's pretty long so I'm waiting until I can commit the time.
I looked up Martyrs and it's a Weinstein film so I will skip that one. I enjoy existential horror, but sadistic french films (I think sadism is named after the marquis de Sade, a famous french pedophile), particularly sexually sadistic films involving children and being proliferated by jews, are not something I have time for.
I think any horror film I will watch will have to be Halloween themed like these ones https://youtu.be/4JAEUpGTVhM
Some of the best films are the longest unfortunately for you... But the cliche family-night horror films from the list you put out can be entertaining horror, albeit, not very scary, so for me it misses the mark on "scariest horror movie."
(post is archived)