This is a poetic and figurative phrase that can have several interpretations depending on the context. Here are some possible meanings:
* A heart that is emotionally closed off or guarded: The "face" of the heart can be seen as representing its vulnerability and openness. A heart without a face is one that is hidden and protected, unwilling to let others in.
* A heart that is devoid of emotions or compassion: The "face" of the heart can also represent its ability to feel and express emotions. A heart without a face might be seen as cold, indifferent, or lacking in empathy.
* A heart that has been wounded or broken: The "face" of the heart could be damaged or scarred, making it difficult for it to function properly or connect with others.
Ultimately, the meaning of "corazon sin cara" depends on the specific context in which it is used.