Bad Influence
Negative Impact, Harmful Effect
noun
影響 is "influence," so an evil influence is a bad influence.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
あの男がみんなに悪影響を与えたんだよ。
That man was a bad influence on all of us.
悪影響が自分の子どもにまで及んでいたことに気が付き、彼女は泣き出した。
She cried as she realized that her bad influence filtered down to her children.
YouTubeは便利だけど、子供に悪影響が出そうな動画もあるから注意が必要だよね。
YouTube is convenient, but we need to be careful because some videos may be harmful to children.
スマホが人類にもたらした悪影響は計り知れないと思うよ。
I think the negative impact that smartphones have had on humanity is immeasurable.