How strong is Thanos without the gauntlet?

He's really kind of above Thor level without the gauntlet. There's a great two parter in a Marvel Team-Up/Marvel Two-In-One set of annuals where Thanos takes on the Avengers, Spider-Man, Captain Marvel and the Thing and is holding his own (ewwww!) until Adam Warlock appears.

He's extremely strong.

Remember he put a beat down on Hulk, no less. Not many beings can match his physical prowess or intellect. I think above Thanos, you'd be looking at Celestials, Heralds of Galactus, Galactus himself, The Beyonder, Infinity, Eternity, Eon and most of the magic beings like Dormamu or Mephisto who could defeat him. Perhaps the only human mortal that could beat him in some fashion would be Doctor Doom.

Interesting in comic book history, Thanos's own mother tried to kill him when he was born, due to his monstrous size and skin color. His father made him fight with his siblings (thus the reason he made his own children fight each other), even though the young Thanos was a Pacifist. It was his search for real meaning that brought him to look at Death as a pure being and worship it. And the Titan that he was born on is the same moon of Saturn that we call Titan, at least in the comics.

Anyway, I'm getting off on a tangent.

He's in the Top 15 of strongest Marvel characters for sure.

Thanos is a Titan, a race that is probably comparable to Asgardians, being many times stronger and more durable than humans.

But Thanos is a mutant among the Titans. His strength is many times that of a Titan, putting him in the Hulk's class even without the Infinity Gauntlet.

Definitely much stronger than Cap.

Well, in the Marvel universe he's a Class 100+

Unlike Hulk, who gets stronger the angrier he gets, Thanos does top out at some point.

In the movie scene where Thanos beats Hulk, we can assume that Hulk (for some reason) didn't get angrier once the fight began...perhaps he was in shock at how strong Thanos was, and he was knocked out before he could amp his strength.

A THOUSAND times stronger than Cap. Or so I’ve heard.

With that in mind, seeing Cap hold back that Infinity Gauntlet punch is a real jaw-dropping moment. Yeah, Steve was never real a match for Thanos but you have to admire his own strength (I’m sure Thanos did as well) and... heart.

Well, Endgame answered my question.