Diffusive :: Diffusive (a.) Having the quality of diffusing; capable of spreading every way by flowing; spreading widely; widely reaching; copious; diffuse.
Diffusiveness :: Diffusiveness (n.) The quality or state of being diffusive or diffuse; extensiveness; expansion; dispersion. Especially of style: Diffuseness; want of conciseness; prolixity.
Self-diffusive :: Self-diffusive (a.) Having power to diffuse itself; diffusing itself.