* Soften: This means to make something softer or more pliable. "The rain softened the ground."
* Mellow: This implies a gradual softening, often of something harsh or intense. "The music mellowed his mood."
* Dampen: This verb suggests a reduction in intensity or strength, which can be similar to softening. "The cold air dampened their enthusiasm."
It's important to understand the specific meaning you want to convey to choose the most appropriate verb.
If you can provide more context about what you want to express, I can give you a more specific answer!