Abomination

"The Abomination" was a title used by Daleks to refer to something which was of extreme disgust to them.

Things which have been referred to as the Abomination were:
 * The Special Weapons Dalek. (DWN: Remembrance of the Daleks)
 * The Bad Wolf entity. (DW: The Parting of the Ways)
 * Dalek Caan after he saw time itself. (DW: The Stolen Earth, Journey's End)
 * A Dalek mutant that had been genetically altered to be passive and benign. (GN: The Only Good Dalek)

It was also the name of a living painting (see The Abomination).