unsprung

adj

1. (not-comparable)Not sprung.

   “an unsprung trap”

2. (not-comparable)Not supported by the suspension of a vehicle.

   “The locomotive is carried on two six-wheel bogies, the outer axles of each bogie being driven by series type d.c. motors, completely suspended to reduce the unsprung weight to a minimum.”

   “Amongst the factors peculiar to electric m.u. traction are the heavy unsprung weight of the motors (generally, the greater the weight, the worse is the riding); […].”

3. (not-comparable)Not fitted with springs; lacking springs.

   “The Winchburgh Shale Line is of 2 ft. 6 in. gauge. The surface trucks or tubs are cuboidal metal boxes mounted on unsprung four-wheeled chassis.”

   “He had an unsprung trailer for the job[.]”

verb

1. (form-of, participle, past)simple past and past participle of unspring