Bastard

"Bastard" was an insult and a descriptive term.

As an insult
Gwen Cooper called Jack Harkness a bastard after he slipped retcon in her drink. (TV: Everything Changes)

Davey Morgan used the word to describe the individuals who he believed killed his cat. (PROSE: Border Princes)

Owen Harper once observed, "Bastard John's taken our SUV." (TV: Exit Wounds)

As a description
It was also used for individuals who were born out of wedlock. Ewan McCrimmon thought Jamie McCrimmon was a bastard because he didn't know who his father was. (PROSE: On a Pedestal)

Elizabeth I was declared a bastard at age two, as her mother Anne Boleyn had allegedly committed adultery. Under Queen Mary I's reign, married priests had their marriages made unlawful, meaning that their children would be regarded as bastards. (AUDIO: The Marian Conspiracy)