The crossword solution for the term 'literally, Greek for 'without breath'' is APNEA, which is a five-letter word. Apnea is a medical term used to describe a temporary cessation of breathing. It is most commonly associated with sleep apnea, a disorder in which a person's breathing is interrupted during sleep. Apnea can also be caused by other medical conditions, such as asthma or heart failure. The Greek root of the word literally means 'without breath'.