"Thoughtless" is a song by Korn and the second single from their fifth album, Untouchables. It is about Jonathan Davis (the band's singer) being assaulted and harassed in school and dreaming of seeking revenge on those who bully him.
There is also a music video for this single, directed like the video for the previous single, "Here to Stay", by The Hughes Brothers. The plot of this video revolves around a young individual from high school who is picked on, beaten up, laughed at, and ridiculed with Korn performing inside the brain of this tormented boy. He seeks revenge throughout the video. The final scene shows him arriving at the school prom with an escort. He then vomits at those who had picked on him from across the auditorium, leaving them in disgust and humiliation.
This song was introduced to fans during a live show in Hammerstein Ballroom, NYC on June 10, 2002 which celebrated the release of the band's fifth album, Untouchables, and appears on the DVD release entitled Korn Live which presents that performance from New York City's well known venue. It has been played during the Untouchables promotional tour in 2002, but it was scrapped one year later from the band's setlist. It eventually returned in 2006 on the See You on the Other Side World Tour as a part of Medley. The full song was played on the 2006 Family Values Tour.
There is also another video that only shows KoRn performing the song in the room featured in the other video.
The song has been covered by rock band Evanescence, both on tour and for the 2004 live album Anywhere but Home, with a different intro that features piano arrangements. Lead singer Amy Lee said at the beginning of the performance, "We're going to do something completely different now. This is by a band that we all like very much. I'm not even going to announce it; you ought to know what this is."