Empathy

Empathy is the capacity to, through consciousness rather than physically, share the sadness or happiness of another sentient being.

Etymology
The English word is derived from the Greek word ἐμπάθεια (empatheia), "physical affection, passion, partiality" which comes from ἐν (en), "in, at" + πάθος (pathos), "passion" or "suffering". The term was adapted by Rudolf Lotze and Robert Vischer to create the German word Einfühlung ("feeling into"), which was translated by Edward B. Titchener into the English term empathy.

Alexithymia from the Ancient Greek words λέξις (lexis) and θύμος (thumos) modified by an alpha-privative—literally "without words for emotions"—is a term to describe a state of deficiency in understanding, processing, or describing emotions in oneself.