General opposites:
* Relaxed: This is a common and direct opposite of stressed.
* Calm: This implies a state of tranquility and peace.
* Serene: This is a more formal and poetic way to say calm and peaceful.
* Tranquil: Similar to serene, implying a state of quietness and stillness.
* At ease: This suggests a feeling of comfort and lack of worry.
* Content: This implies a feeling of satisfaction and happiness.
* Happy: This is a general feeling of joy and contentment.
More specific opposites:
* Unburdened: This means free from worry or responsibility.
* Relieved: This implies a sense of release from stress.
* Refreshed: This suggests a feeling of being energized and invigorated.
* Energized: This means full of energy and enthusiasm.
* Motivated: This implies a feeling of being driven and focused.
The best word to use depends on the specific situation and the meaning you want to convey.