For "motionless" or "quiet":
* Static
* Stationary
* Immobile
* Unmoving
* Silent
* Tranquil
* Calm
* Serene
* Peaceful
For "yet" or "nevertheless":
* However
* Nonetheless
* Even so
* Despite
* Regardless
* Notwithstanding
For "continue" or "remain":
* Remain
* Continue
* Persist
* Endure
* Carry on
For "calmly" or "patiently":
* Calmly
* Patiently
* Quietly
* Composedly
* Serene
Please provide more context about how you're using "still" so I can give you a more precise synonym.