Harassment

Harassment refers to uncalled for words or types of conduct which tends to bother or abuse another person. Typical name-calling ("you are stupid" or " you are really a dummy") is a common form of harassment.

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Additional Sources

Duhaime Legal Dictionary

Unsolicited words or conduct which tend to annoy, alarm or abuse another person.

Legal-Dictionary.org

Words, such as threats, taunts or abusive language, and actions, such as offensive gestures, directed against a person which serve no legitimate purpose and tend to distress the listener.

The Free (Legal) Dictionary

the act of systematic and/or continued unwanted and annoying actions of one party or a group, including threats and demands. The purposes may vary, including racial prejudice, personal malice, an attempt to force someone to quit a job or grant sexual favors, apply illegal pressure to collect a bill, or merely gain sadistic pleasure from making someone fearful or anxious. Such activities may be the basis for a lawsuit if due to discrimination based on race or sex, a violation on the statutory limitations on collection agencies, involve revenge by an ex-spouse, or be shown to be a form of blackmail ("I'll stop bothering you, if you'll go to bed with me"). The victim may file a petition for a "stay away" (restraining) order, intended to prevent contact by the offensive party. A systematic pattern of harassment by an employee against another worker may subject the employer to a lawsuit for failure to protect the worker.

Wikipedia

Harassment covers a wide range of offensive behaviour. It is commonly understood as behaviour intended to disturb or upset. In the legal sense, it is behaviour which is found threatening or disturbing.