In psychology , anhedonia ( ( Greek Î Î 1\/2 - an - , without + Î Î Î Î 1\/2 Î hÄ `` donÄ `` , pleasure ) is not finding happiness or fun in activities that are normally fun for the person . This may include things like eating , exercise , watching movies , meeting friends , social activities , or sexual interaction . In psychology and psychiatry , anhedonia ( ( Greek á 1\/4 Î 1\/2 - an - , `` without '' + á 1\/4 Î Î Î 1\/2 Î hÄ `` donÄ `` , `` pleasure '' ) is defined as the inability to experience pleasure from activities formerly found enjoyable , e.g. hobbies , exercise , social interaction or sexual activity .