In this sentence, does most mean very, or is it a shorter version of the most? Are both meanings possible here?
Well, the diseases that human beings focus on are the ones considered most unbearable.
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In this case "most" can stand in for "the most" and "very" but it could also be thought of to mean "extremely", however to me your excerpt reads:
well, the diseases that human beings focus on are the ones that are considered the worst to bear.