The antonyms of *acclivitous* are *declivitous* and *downhill*. Use *declivitous* to describe a slope that is descending, and *downhill* to describe the direction of movement towards the bottom of a slope or decline. These antonyms can be used in outdoor activities, geography, and technical writing.

등산객은 *경사로* 트레일을 내려가는 것보다 순응하는 트레일을 오르는 것이 더 쉽다는 것을 알게 되었습니다.

ハイカーは、*卑劣な*トレイルを下るよりも、順応のトレイルを登る方が簡単だと感じました。

The hiker found it easier to climb up the acclivitous trail than to descend the *declivitous* one.

스키어는 *내리막*을 가면서 속도를 높였습니다.

スキーヤーは*下り坂*に行くにつれてスピードを上げました。

The skier picked up speed as he went *downhill*.