sclerotic (adjective) – hardening of a body part or tissue, or (figuratively) becoming stiff and inflexible

sclerosis (noun) – a hardening of a body part

Here are some examples of how you can use sclerotic:

My grandmother suffered from MS, which is short for Multiple Sclerosis, due to which she passed her last days in a wheelchair.

Have you heard of a new sclerotic treatment for varicose veins?

The jury with their sclerotic brains are always choosing the same kind of candidates.

It will take a long time before you see your money from the Social Security. What else can you expect from such a sclerotic organization?

The question remains whether the Pope’s fresh ideas can really have an impact on the sclerotic dogmas of the Church.