General opposites:
* Sad: This is the most direct opposite, meaning feeling unhappiness or sorrow.
* Unhappy: This is a broader term encompassing any negative emotion.
* Displeased: This implies a specific dissatisfaction with something.
* Regretful: This conveys a feeling of sorrow for something done or not done.
More specific opposites:
* Angry: This describes a feeling of strong displeasure or hostility.
* Worried: This implies a feeling of anxiety or unease.
* Disappointed: This conveys a feeling of sadness or frustration because something did not meet expectations.
* Dismayed: This implies a feeling of shock and disappointment.
The best opposite will depend on the specific situation and the intended meaning.