Undisirable effect
clout
If someone is a bad influence, they do bad things in front of a person who has a connection to the person. Same as a positive influence, except good things.
Bad behavior or misbehavior can be called misconduct. Similar words are delinquency and mischief.
To have an effect on someone
because of your bad grammar and yo mama
The word itself, as with all words, is neither good or bad. Nor is influence necessarily good or bad. It is the use to which we put any influence we have that may have good or bad repercussions.
Bad Influence
A bad influence is a source, such as a media source or another person, which encourages a person to do and think wrong by example.
influence
influence
her word for bad food
influence
clout
Profanity or obscenities are common synonyms for bad language.
The word is change. One thing will influence to change another thing.
Another word for bad is naughty
control, influence