The word "most uncorrectable" means something that cannot be corrected or fixed. Its antonyms, on the other hand, are words that indicate its opposite, namely "correctable," "fixable," "solvable," "reversible," and "mendable." Correctable refers to something that can be rectified, while fixable means able to be repaired or restored. Solvable implies that a particular issue or problem can be resolved through a logical or feasible solution. Reversible indicates that an action or effect can be undone or be brought back to its original state. Lastly, mendable refers to something that can be patched up or repaired through means of fixing or adjusting.