The goal of this clinical trial is to learn if group acceptance and commitment therapy works to improve depressive symptoms, psychological flexibility and quality of life in adults. The main questions it aims to answer are: 1. What is the effectiveness of group Acceptance and Commitment Therapy (ACT) in reducing depressive symptoms among depressive patients in Kelantan from pre- to post-intervention and at 3 months follow-up? 2. What is the mean difference of quality of life among depressive patients in Kelantan who undergo group ACT from pre- to post-intervention and at 3 months follow-up? 3. What is the effectiveness of group ACT in improving the psychological flexibility among depressive patients in Kelantan from pre- to post intervention and at 3 months follow-up? Researchers will compare group ACT group to a treatment-as-usual (TAU) group to see if group ACT works to improve depressive symptoms, quality of life and psychological flexibility. Participants will: * Attend weekly ACT sessions for four weeks or undergo standard treatment for major depressive disorder. * Fill up four questionnaires before the intervention, after a month and at 3-month follow-up.
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Depressive symptoms
Timeframe: From enrollment to the end of treatment at 4 weeks
Quality of life
Timeframe: From enrollment to the end of treatment at 4 weeks
Psychological flexibility
Timeframe: From enrollment to the end of treatment at 4 weeks