killjoyEnglishOxford American Thesauruskilljoy noun sun worshippers feel the anti-sun lobby are just killjoys: spoilsport, moaner, complainer, mope, prophet of doom, Cassandra, Jeremiah, death's head at a feast; puritan, prig, prude; Australian, New Zealand wowser; informal wet blanket, party pooper, misery, dog in the manger.