Every set of circumstances is different. One thing to remember is that there is a very good chance that if the lion is not hungry, he is probably asleep.
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So long as the human kept their distance, their chances of survival would be reasonably good. Saying all that, if the lion felt in any way threatened this would end badly for the human.
Below – this guy looks pretty pissed of so get too close and you are in big trouble:
Below – this guy is dozing in the sun and unlikely to stir himself into action unless you get too close:
As said, all circumstances are different and very difficult to predict.