The term 'state of inactivity' can be described by four different crossword solutions: STASIS (6 letters), REST (4 letters), REPOSE (6 letters), and PARALYSIS (9 letters). STASIS is a state of inactivity or equilibrium, where all forces are balanced. REST is a period of inactivity or relaxation, often associated with sleep. REPOSE is a state of REST or tranquility, often used to describe a peaceful death. Finally, PARALYSIS is a complete loss of movement or sensation, usually caused by a medical condition.