That has or have been made soft or softer (in various non-physical senses), e.g. more sympathetic or gentle, less forceful or vehement, fainter or…

That has been mollified; appeased, conciliated; †softened, rendered soft or supple (obsolete); †made less severe; mitigated (obsolete).

Of a person, or a person's character, emotions, work, etc.: mature; softened by age and experience; having the gentleness or dignity of maturity.