A hater is a person who hates on a person for no conceivable reason, just hates, no opinions needed.

A hater is not...

1. A person with justifiable reason to hate someone.
2. A Person who expresses true opinion, or justifiable dislike for something(a music artist, band, singer, etc)

Hater is a word often over used by the youth of today as a defense mechanism when you down their favorite rapper, singer or band. The word "hater" is often mislabeled as people with honest or differing opinions from what's popular today. Most people of generation y can't take opinion or know how to form opinions, just to dick ride what ever they hear on the radio now days.

A person that simply cannot be happy for another person's success. So rather than be happy they make a point of exposing a flaw in that person.

Hating, the result of being a hater, is not exactly jealousy. The hater doesnt really want to be the person he or she hates, rather the hater wants to knock somelse down a notch.

Overused word that people like to use just because someone else expresses a dislike for a certain individual.

A person that develops a strong dislike for another, solely basing their own opinion on personal judgment rather than objective merit. The formation of a hater's contempt commonly arises from jealously and/or resentment. Individuals that make fun of, or "hate," others for justified reasons cannot be legitimately classified as "haters;" although many faggots attempt to rationalize their own situations by doing so. Additionally, the word "hater" is frequently overused, mainly by members of the rap and hip-hop communities.

A person who feels anger and/or jealousy for someone who has succeeded in something they have worked hard for.
A being who speaks badly,and/or takes negative actions in attempt to create problems for a successful person.

Anyone with a opinion.

A label applied to people who are more negative than positive when discussing another person. It most commonly refers to individuals whose negativity is so extreme that it is all-consuming. However, there are various levels and forms of being a hater, ranging from completely dismissing any positive traits or actions, to merely painting a less than flattering picture by using words with negative connotations. Hating is often attributed to jealousy, but just as often, it seems to stem from some other source.

The most non-insulting "insult" in existence. It's a waste of breath to say it and a waste of energy to type it. This term is often used by pre-teen girls whenever someone insults their favorite teeny bopper singers. If you ever call somene a hater, find the nearest knife and use it pierce your lungs for polluting our air with that fucking stupid word.