What is "bumpiest"

Usage examples of "bumpiest".

The boat had filled quickly, and by the time the Copelands arrived, after a frantic last-minute bemo ride, clutching guardrails, their baggage, one another, through the narrowest, bumpiest, crookedest streets in town, they were lucky to claim a patch of space the size of a throw rug on the padded floor mats near the starboard side.