You-th

You-th: noun. The apparent vitality and young-ness of all those around you, even if they're older than you, after a particularly long and exhausting day/week/month/year/life. In 2020, the editors of the DSM shall discuss whether to add you-th to the list of causes of depression. You-th is most commonly identified by a particularly strong disregard for anyone too energetic or happy about their own lives, but importantly, this feeling has to be stronger than it is on 'normal' days.