Impasible (en. Impassive)
/im.pa.si.ble/
Slang Meanings
A person who always remains calm and does not worry about anything.
He is totally impassive, not even flinching at bad news.
Es un impasible total, ni se inmuta ante las malas noticias.
Someone who seems to have no emotions in critical situations.
That guy is so impassive that he seems like he's from another planet.
Ese tipo es tan impasible que parece de otro planeta.