Synonyms:
* Slide: This implies a smoother, more controlled movement than slithering.
* Creep: This suggests a slower, more deliberate movement.
* Wriggle: This implies a more energetic, twisting motion.
* Glide: This implies a smooth, effortless movement.
* Slink: This suggests a stealthy, secretive movement.
Antonyms:
* Stroll: This suggests a leisurely, upright walk.
* March: This implies a purposeful, rhythmic walk.
* Run: This suggests a quick, energetic movement.
* Leap: This implies a sudden, powerful jump.
* Soar: This suggests a high, effortless flight.
The best synonym or antonym for "slither" will depend on the specific context in which you are using the word.