Mellowness
Part of speech: noun
Definition: The property of being mellow.
Fullness
Part of speech: noun
Definition: Being full; completeness.The degree to which a space is full.(fig.) The degree to which fate has become known.A measure of the degree to which a muscle has increased in size parallel to the axis of its contraction. A full muscle fills more of the space along the part of the body where it is connected.
Example sentence: It's lack that gives us inspiration. It's not fullness.