Empathy

You observe one humanoid you can see. You instantly gain insight into its current mood (such as if it is happy, sad, or frustrated), its disposition toward you (such as friendly, hostile, or indifferent), or an aspect of its personality. You learn this information regardless of ever having interacted with the target. 

For example: You man learn they are fearful of magic, inclined towards violence, or are meek and easily persuaded.  

Misunderstanding: When the spell is cast, the DM rolls a D20. On a 20, the information given to the caster is false, but they believe it to be true.