Circle of Two....Obsession 1981 This movie was so hated, they had to rename it. I actually thought it was really good. Only 640 votes in IMDB.
The story of the impossible love between a schoolgirl and a sixty-year-old painter. Tatum O'Neal and Richard Burton
https://www.youtube.com/watch?v=840IAPnSINo&t=962s
Three horror/thriller TV movies come to mind:
Reflections of Murder (1974) - Tuesday Weld & Sam Waterston in a surprisingly great re-adaptation of the novel Celle qui n'était plus, upon which Diabolique (1955) was based. (fewer than 400 IMDb ratings)
Guilty Conscience (1985) - Anthony Hopkins as a calculating killer lawyer. (under 900)
A Cold Night's Death (1973) - Robert Culp & Eli Wallach as researchers afraid something is amiss in their remote, snowy research facility that will likely appeal to fans of The Thing (1982). (under 1000)
Heaven’s Gate (80) had a dynamite cast but I don’t know anyone personally who has seen it. The reviews were pretty negative and it was a legendary flop in theaters although some recent critics have more or less stated ‘it’s not really that bad, give it a go…’
I’ll watch it one of these days but it never seems available on streaming services.