Saudade

Saudade (or missing someone) is a deep emotional state of nostalgic or profound melancholic longing for an absent something or someone that one loves. Moreover, it often carries a repressed knowledge that the object of longing might never return. A stronger form of saudade might be felt towards people and things whose whereabouts are unknown, such as a lost lover, or a family member who has gone missing, moved away, separated, or died.

Based on information from WikipediaAPA Dictionary of Psychology
All Emotions (56)