From the German welt, meaning 'world', and schmerz, which can be translated as 'pain', 'grief', or 'agony'. Weltschmerz is often translated as world-sorrow, or world-weariness. It is often capitalized.
2. Sadness over the state of the world. (Many dictionaries define it as "sadness over the woes of the world", or "Sadness over the inability of the world to live up to ideals").
3. Pessimism, especially romantic pessimism.
4. A mood of sentimental sadness.
5. Slang for heroin withdrawal.