Answer: Immobile means can't move, Articulating means they can move. The 2 words are antonyms to eachother.
Step-by-step explanation:
Articulating means having joints that move. For example, The prosthetic hand is articulated. Meaning the prosthetic hand can move because it's articulated.
Immobile means it can't move. For example, the prosthetic hand's fingers can't move, meaning they're immobile.
The 2 words are antonyms to each other, I hope this is what you meant and that I could help!