Definitions of unhappy:

• adjective:   causing discomfort

  Example: "The unhappy truth"

• adjective:   experiencing or marked by or causing sadness or sorrow or discontent

  Example: "Unhappy over her departure"

• adjective:   marked by or producing unhappiness

  Example: "Unhappy caravans, straggling afoot through swamps and canebrakes- American Guide Series"

• adjective:   generalized feeling of distress