(of a surface 平面 not even; with a lot of bumps 不平的；多凸块的 a bumpy road/track 崎岖不平的道路／小道 He rode over the bumpy ground on his mountain bike. 他骑着山地车在崎岖不平的地面上行驶。
Extra ExamplesThe road was getting bumpier and we had to hold on to our seats. 道路越来越崎岖不平，我们不得不保住座位。 She felt quite sick from the long drive over the bumpy road. 在颠簸的路上长时间行驶让她感到很不舒服。
(of a journey 行程 uncomfortable with a lot of sudden unpleasant movements caused by the road surface, weather conditions, etc. 颠簸的 a bumpy ride/flight 颠簸的行车／飞行 a very bumpy ride through country lanes 穿越乡间小路的颠簸之旅
Idioms
have/give somebody a bumpy ride
to have a difficult time; to make a situation difficult for somebody （使）处境艰难