An increasingly impatient child who is become more tense and unruly is an example of someone who would be described as restive.
A horse that won't move forward no matter how much you pull on the reins is an example of a horse that would be described as restive.
Origin of restive
- Middle English restif stationary from Old French from rester to remain from Latin restāre to keep back re- re- stāre to stand stā- in Indo-European roots
From American Heritage Dictionary of the English Language, 5th Edition