What about a board game is the most likely to turn you away from wanting to play it, or even try it in the first place? It could be a theme you don't like, mechanics that bother you, bad art, or anything else.
For me, I really don't like games that involve lying or deception. I'm thinking of bluffing or social deduction games like #Werewolf, #Coup, #Secret Hitler, etc. I'm a bad liar to begin with so I'm at a disadvantage there, but I also don't like how the name of the game is being deceptive and manipulative with your friends. I can see the appeal, but they're just not for me.
What is it for you?