A blackbody will never

A perfectly black body is defined as an ideal physical body that completely absorbs all electromagnetic radiation incident upon it, regardless of frequency or angle of incidence.

Since it absorbs all incident radiation, its absorptance is $1$, while its reflectance and transmittance are both $0$.

Because it does not reflect any radiation, it will never reflect radiation. Because it does not transmit any radiation through it, the phenomenon of refraction cannot occur.

A blackbody does emit radiation (known as blackbody radiation) depending on its temperature, and it absorbs all incident radiation.

Therefore, a blackbody will never reflect or refract radiation.