intensive

/in-ˈten(t)-siv/

adjective

  1. of, relating to, or marked by intensity or intensification: such as

  2. highly concentrated

  3. tending to strengthen or increase; especially : tending to give force or emphasis

intensive study

noun

  1. an intensive linguistic element

noun

  1. the continuous monitoring and treatment of critically ill or injured patients using special medical facilities, equipment, and services

  2. a designated area in a hospital providing intensive care : intensive care unit —often hyphenated when used before another noun

Many of the sickest patients need intensive care, even to the point of being connected to a mechanical respirator.