I'd say bad cofounder, because you can find someone as a solo founder, but you have to first get rid of a bad cofounder (or put up with it).
I'd break it down into 3 things to look for in a cofounder: proof that they're hard-working, that they have complementary skills, and that you really gel with each other. Kinda gotta feel the last one out, but the others should show up in their past work and their work ethic.
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I'd say bad cofounder, because you can find someone as a solo founder, but you have to first get rid of a bad cofounder (or put up with it).
I'd break it down into 3 things to look for in a cofounder: proof that they're hard-working, that they have complementary skills, and that you really gel with each other. Kinda gotta feel the last one out, but the others should show up in their past work and their work ethic.