Definition of motionlessness in US English:

motionlessness

noun

  • The state or condition of being motionless, lack of motion; inactivity, inertness.

Origin

Early 19th century; earliest use found in James Gilchrist (1783–1835). From motionless + -ness.

Pronunciation

motionlessness

/ˈməʊʃnləsnəs/