Habitually idle and lazy; slothful; dull; inactive
Having no power to move oneself or itself; inert.
Exhibiting economic decline, inactivity, slow or subnormal growth.
Characteristic of a sluggard; dull; stupid; tame; simple.
Slow; having little motion.
Ultrasonic, having a frequency too high to be audible.
Greater than the speed of sound (in the same medium, and at the same temperature and pressure).
An aircraft that can travel at the speed of sound.