a. not in accordance with or determined by nature; contrary to nature
a. 不自然的, 反常的, 不近人情的
[法] 不自然的, 违背人道, 邪恶的
1. The bright colors of the fake flowers look very unnatural.
假花的鲜艳颜色看起来非常不自然。
2. His smile seemed unnatural during the serious discussion.
在严肃的讨论中，他的微笑显得很不自然。
3. It is unnatural for animals to live in such small cages.
动物住在如此狭小的笼子里是不自然的。