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I asked this question because the other question on workplace.se. I realized that "enemy" is not the right word to express my idea.

I was working with that person for about a year. He was bad at work and never followed the rules or standards. I didn't like him because of his performance, not because of his personality.

What are some words I could use to call him?

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closed as too broad by tchrist, phenry, FumbleFingers, Kris, p.s.w.g Aug 7 '14 at 15:49

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.

Like slacker?... – mplungjan Aug 6 '14 at 6:47
Do not call him anything. It is not for us to judge others, especially at the workplace. You should not have "didn't like him because of his performance," which is improper. This is an etiquette/workplace related issue, though. If you still want to know the word you are looking for, post an appropriate impersonal question here. – Kris Aug 6 '14 at 8:27
@Kris, I told the story to clarify the question. Without context, it might be misleading. :) – Anonymous Aug 6 '14 at 8:48

You could label this person as being an incompetent colleague. Incompetent expresses the concept that an employee is unable, for whatever reason, to perform or carry out his or her duties at work to the best of their ability. It is a formal and common expression, easily understood by all.

People were shocked that he allowed some of his incompetent workers to stay on after a mistake.

Source: Dictionary.com
If you prefer a more informal expression you could talk about your co-worker's shoddy work, or shoddy workmanship, which implies the employee took short-cuts, used inferior quality materials, and generally had a lax attitude concerning projects, tasks, meeting deadlines etc.

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I think unprofessional may describe the employee attitude you are referring to:

  • not characteristic of or befitting a profession or one engaged in a profession; " unprofessional conduct"; "unprofessional repairs"

Also a shirker, ( as a more informal definition)

  • a person who evades work, duty, responsibility, etc.

Source: http://www.thefreedictionary.com

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Words like shirker and slacker do not have currency in modern management thinking since they are too moralistic. And the purpose of management is not to make judgments about people. It is to fit round pegs in round holes and square ones in square holes.

Nowadays a professional manager might say that the individual concerned was not motivated to succeed in his present role and circumstances.

Often a person who has not appeared motivated in one particular job, location, or with one particular supervisor can perform quite differently if moved.

That is not to say that there are not some people around whom it is very difficult to place.

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