Etymology
Advertisement

killjoy (n.)

also kill-joy, 1776, from kill (v.) + joy. Kill formerly was used with other stems (for example kill-courtesy "boorish person," kill-cow "bully, big man," etc.; also compare Kellogg).

updated on March 13, 2016

Advertisement
Advertisement
Definitions of killjoy from WordNet

killjoy (n.)
someone who spoils the pleasure of others;
Synonyms: spoilsport / wet blanket / party pooper
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.