How is this translation of "the immutable system engenders rot"?

Question

My sentence is "the immutable system engenders rot." Diagramming the English sentence:

• immutable: adjective, modifying the subject
• system: noun, subject. in context, refers to the system in the same sense as political system/constitutional order, or economic system
• engenders: our verb, passive, third person, present
• rot: our object, noun (but apparently not a gerund in english?)

For Latin vocabulary, I picked:

• inmutabilis
• mos (maybe not a great choice?)
• gigno (note - english engender's is from latin ingenerare, when would you use which one?)
• putesco

giving me:

inmutabilis mos putescendum gignitur

Which is kind of a mouthful. Did I do the grammar right, and do you have any feedback on word choice?

Answer 1

I think the most Latin way of translating this phrase, even if it means taking a little liberty, is "what doesn't move rots".

Putescit quod non movet.

You may want to add "et non movetur" (and is not moved).

Putescit quod non movet et non movetur.

Answer 2

We can also attempt a somewhat more literal translation.

• For "system," as in a political system, I would suggest constitutio, which seems like a good fit (unless, in a Neo-Latin context, it could be confused with the idea of a written constitution). Mos, I would not have understood as "system."

• Putescendum is wrong because in the accusative, you would use the infinitive; however, this seems like a very unusual way to phrase it. And there is a much simpler word for rot anyway: caries.

Thus we might say: Immutabilis gignit constitutio cariem.