There is a German word, Sehnsucht, which has no English equivalent; it means 'the longing for something'. It has Romantic and mystical connotations; C.S. Lewis defined it as the 'inconsolable longing' in the human heart for 'we know not what'. It seems rather German to be able to specify the unspecifiable. The longing for something - or, in our case, for someone.
Julian Barnes