in·er·tia 
/ɪˈnɚʃə/ noun
/ɪˈnɚʃə/ noun [noncount] 1 a : lack of movement or activity especially when movement or activity is wanted or needed
▪ He blames governmental/bureaucratic inertia for the holdup.
b : a feeling of not having the energy or desire that is needed to move, change, etc.
▪ After 10 years in an unsatisfying job she overcame her inertia and went back to school. 2 physics : a property of matter by which something that is not moving remains still and something that is moving goes at the same speed and in the same direction until another thing or force affects it
▪ He blames governmental/bureaucratic inertia for the holdup.
b : a feeling of not having the energy or desire that is needed to move, change, etc.
▪ After 10 years in an unsatisfying job she overcame her inertia and went back to school.
— in·er·tial /ɪˈnɚʃəl/ adjective, physics
▪ an inertial sensor
/ɪˈnɚʃəl/ adjective, physics ▪ an inertial sensor
