Unaltered synonyms and antonyms

So what is it that keeps unaltered in the moving triangle ?

This is the only case of an ancient Greek fountain of such an early date, unaltered and intact.

If some of the anions, instead of being simple iodine ions represented chemically by the symbol I, are complex structures formed by the union of iodine with unaltered cadmium iodide - structures represented by some such chemical formula as I(CdI 2), the concentration of the solution round the anode would be increased by the passage of an electric current, and the phenomena observed would be explained.

That country, left by the Treaty of Berlin with its status unaltered, was in a continued condition of disturbance.

Here the middle part of the solution is unaltered and the number of ions liberated is the same at either end, but the amount of salt left at one end is less than that at the other.