killjoy

noun

Etymology: From kill + joy, first attested in 1776.

1. A person who is anti-fun, or prevents others from having fun.

   ““If you mean me, sir, I call you and every one else to the inspection of my professional life. As to Christian or unchristian, I repudiate your canting palavering Christianity; and as to the way in which I spend my income, it is not my principle to maintain thieves and cheat offspring of their due inheritance in order to support religion and set myself up as a saintly Killjoy....””

   “What kill-joy have we here? […] I feel it in my bones some rascal is come to Galing, one that bringeth ill hap in his pocket and a shadow athwart the sun on this our day of festival.”