Ninda

Ninda ( ਨਿੰਦਾ ninḏā) or Nindeya are words in Punjabi which mean to slander, slur, backbite or smear and are words used to describe a defamatory or negative statement made about someone. The derogatory account is usually made when the person about whom the venom is being spat is not present or is not within ear-shot of the conversation. 
This type of harmful speech (or "Nindeya") is usually carried out to cause harm to the other person, to ruin the other person's reputation or generally to denigrate the other person's status. The main reason and motivation for slandering is that it gives the maker of the slander "satisfaction" as it makes them feel important and they feel they are "better" and more "righteous" than the person being slandered. The Sikh Gurus condemn this action and write against this ugly habit.
By performing Nindeya, one pollutes ones own mind. When a person wants to tell a negative about someone else, it is the motivation that causes harm to the person doing the "nindeya". If you want to tell your friends something negative about another person - stop! Remember, the wise words of the Guru. If you are a Gurmukh move on to something else. Never engage in negative discussions about someone who is not present.
==Truth can also be nindeya==
Some say that telling the truth that is negative is acceptable to Sikhi. This is not correct and is against the words of the Guru. To tell a lie is a wrong and to do nindeya is also wrong. Why engage in telling negative truths about others? The main reason is because the person performing the "nindeya" and the one listening find some "comfort" and "satisfaction" in the performance of "nindeya". In the shabad below, the Guru tells us to shun several negative human activities; action and emotions that we should keep away from; These are: Lust, anger, lies, ninda, maya and ahankar. 
You can see from this list that lies and "ninda" are treated separately as they are 2 different things - and both are vices which one needs to avoid to attain a better spiritual life. The shabad by Guru Ram Das is: 
==Listening to nindeya condemned==
The Guru has harsh words for the person who just listens to "nindeya". So not only is the "nindak" (the slanderer) condemned by the Guru, so is the listener of "nindeya". As a Gurmukh if someone is telling "nindeya", just move away and do not be a part of this negative atmosphere - Do not join in and do not listen. If you can, politely tell your friends to not engage in this negative activity. Listening to this pollution will bring spiritual harm to you and your mind. Peace cannot enter the mind that listens or takes part in “nindeya”. 
==If someone slanders you- consider this a blessing!==
==Nindeya against a saint is worst sin==
The Guru has the harshest words for the nindak (slanderer) who slanders a saint. Beware, hell will be your next stop if you slander a saint!
==Slander and praise both rejected==
On the one hand we slander some and then on the other hand we praise others to gain favours; the Guru rejects this completely. To praise just to gain political mileage is not accepted by the Guru. 
==Other relevant bani==