Synonyms:
* Trembled: This is the most direct synonym, meaning to shake slightly.
* Shuddered: This implies a more intense or involuntary shaking, often due to fear or disgust.
* Shivered: This suggests shaking due to cold or fear.
* Vibrated: This emphasizes a rapid back-and-forth motion.
* Throbbed: This implies a pulsing or throbbing sensation.
Antonyms:
* Remained still: This is the most direct antonym, meaning to not move at all.
* Was steady: This implies a lack of any shaking or movement.
* Stood firm: This suggests a strong resistance to any movement.
* Was composed: This emphasizes a state of calmness and composure.
The specific synonym or antonym you choose will depend on the context of the sentence.