Überglücklich sein.

The German word 'überglücklich' is a compound word formed from 'über-' and 'glücklich'. 'Glücklich' (happy, fortunate, lucky) has a rich history rooted in Germanic languages. It derives from Middle High German 'gelücke' (luck, fortune) and Old High German 'gilucki'. The prefix 'ge-' in Old High German often indicated a collective or perfective aspect, and 'luck' itself has Indo-European roots relating to drawing lots or fate. 'Über-' is a common German prefix meaning 'over', 'above', 'beyond', 'super-', or 'excessively'. It comes from Middle High German 'über', Old High German 'ubar', and has cognates in English 'over', Dutch 'over', and Latin 'super'. This prefix is used to intensify the meaning of the word it attaches to, indicating an excess or a heightened state. Therefore, 'überglücklich' literally translates to 'over-happy' or 'beyond happy', perfectly capturing the sense of extreme happiness and joy. The suffix '-lich' is an adjectival suffix in German, similar to '-ly' in English, forming adjectives from nouns or verbs. The full phrase 'überglücklich sein' means 'to be überglücklich', hence 'to feel extremely happy and joyful, experiencing great delight'. The intensity conveyed by 'über-' is crucial to its meaning, distinguishing it from simply 'glücklich sein' (to be happy). The word has been in use in German for centuries, with the structure and meaning remaining consistent, reflecting a common linguistic pattern for expressing heightened emotions.