Think of mobile as a word with a small hinge in it: something that can swing, shift, be carried. Immobile puts a bar across that hinge. What changes between the uses is only what the bar is made of. Sometimes it is a choice — a cat holding still, a person sitting and watching. Sometimes it is a body that will not obey. Sometimes it is four bolts in a concrete floor. The picture stays the same in all three: nothing is going anywhere.
From the word’s history
From Old French immobile, from Latin immōbilis, which is im- (not) plus mobilis (movable). The word arrives in English already carrying the bar across the hinge.
來自古法文 immobile，再往前是拉丁文 immōbilis，也就是 im-（不）加 mobilis（可移動的）。這個字進英文的時候，那根閂就已經在裡面了。
Wiktionary entry supplied in packet (kaikki:3f6f69a190036ae4:699535923): From Old French immobile, from Latin immōbilis, equivalent to im- + mobile.
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