bad influence; negative influence; harmful effect
Commonly used with collocations such as 悪影響を与える, 悪影響を及ぼす, and 悪影響がある to describe harm caused by a situation, habit, policy, or environment.
睡眠不足は健康に悪影響を及ぼす。
Lack of sleep has a negative effect on health.
その番組は子どもに悪影響を与えると言われている。
That program is said to have a bad influence on children.
Overusing a smartphone has a negative effect on children's eyesight.
If you keep living an irregular lifestyle, it will start showing bad effects on your health.
The economy is being adversely affected by international conditions.
The new regulation was created to prevent a negative impact on the environment.