happy

Before happy meant a warm feeling in your chest, it mainly meant being lucky enough to land on the right side of chance. English borrowed the core idea from Old Norse happ, “luck” or “good fortune,” while Middle English speakers may also have reshaped it under the influence of happyn and the familiar noun hap. The trail reaches back, according to one influential proposal, to Proto-Indo-European *kob-, a root connected with fitting, succeeding, and good omens; its distant relatives include Old Irish cob “victory” and Old Church Slavonic кобь “fate.” That makes happy a linguistic cousin of happen: both hover around the idea of events turning out a certain way. English once had other happiness words, including blithe, while gesælig eventually wandered into the very different modern word silly. So when you say you are happy, you are faintly echoing an ancient verdict from the world of omens: fortune has fit itself neatly into your life.