Once upon a time there lived in Berlin, Germany, a man called Albinus. He was rich, respectable, happy; one day he abandoned his wife for the sake of a youthful mistress; he loved; was not loved; and his life ended in disaster. This is the whole of the story and we might have left it at that had there not been profit and pleasure in the telling; and although there is plenty of space on a gravestone to contain, bound in moss, the abridged version of a man's life, detail is always welcome.
Vladimir NabokovToska - noun /หtล-skษ/ - Russian word roughly translated as sadness, melancholia, lugubriousness. "No single word in English renders all the shades of toska. At its deepest and most painful, it is a sensation of great spiritual anguish, often without any specific cause. At less morbid levels it is a dull ache of the soul, a longing with nothing to long for, a sick pining, a vague restlessness, mental throes, yearning. In particular cases it may be the desire for somebody of something specific, nostalgia, love-sickness. At the lowest level it grades into ennui, boredom.
Vladimir Nabokov