Most softened, which means to have been made less harsh or extreme, can have several antonyms, depending on the context in which it is used. If one is talking about an attitude or tone, then the antonyms could be "harsh," "severe," "stern," "rigid," "intense," or "extreme." However, if one is referring to a physical object or material, the antonyms could be "hardened," "stiffened," "unaltered," "unyielding," or "undiluted." In any case, understanding the antonyms of a word can help one better understand the nuances of its meaning, as well as the different contexts in which it is used.