unnatural

The neon green color of the lake water was caused by unnatural chemical waste leakage.

(Chinese) 湖水呈现出的霓虹绿是不自然的化学废物泄漏导致的。

To many observers, the robot's jerky movements felt creepy and completely unnatural.

(Chinese) 对许多观察者来说，这个机器人僵硬的动作让人感觉毛骨悚然，而且完全不自然。