How can I reject a man politely while making my no feel final?

I’m trying to understand how to handle this better. I’ve posted of this situation last week, where I told a guy I don’t see a connection to proceed with the 2nd date but he still persists.


I went on a date with a guy — he was nice, interesting, and we had a good conversation, but I didn’t feel the right connection to continue. So I sent a polite message saying I enjoyed meeting him, but I don’t see it going further.


The problem is, instead of accepting it, he kept engaging:


asking if there was something specific he could address
saying he really liked me
trying to challenge my reasoning in a logical/playful way
reassuring me that my concerns weren’t an issue
and then inviting me out again


He wasn’t disrespectful — just persistent and trying to change my mind, tell me how exceptional and special the evening felt for him and how he wanted to prove it can work.


Looking back, I think maybe I made the mistake of explaining too much and softening it, which might have made it sound like I was unsure rather than decided. I just tried to protect his ego while making a point that I didn’t want to meet again.


So I’m wondering:


How do you reject someone politely but in a way that doesn’t leave room for interpretation?
Is it better to keep it short and not explain at all?
From a male perspective, what makes a “no” feel final vs. negotiable?


Curious to hear honest opinions, especially from men.

Updates
1 mo
I haven’t replied anything anymore. Now he invites me on his birthday party anyway.
Updates
1 mo
The thing is that I respect him, because he’s not just a guy, he’s very intellectual and incredibly smart and respected in his field. So I kind of like how smart it is. Just not enough for me to see the practical continuation, because he is more of a thinker. I don’t need another person who’s always in his head. I need a man who’s a doer. Not abstract like me.
How can I reject a man politely while making my no feel final?
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