What is the term for the burial of a body that does not include a viewing or ceremony?

The term that best describes the burial of a body that does not include a viewing or ceremony is "direct burial." This process typically involves the immediate burial of the deceased in the ground shortly after death, without the presence of a formal service or the opportunity for family and friends to view the body. Direct burial is often chosen for logistical reasons or personal preferences and is a straightforward option focused solely on the act of burial itself.

In contrast, the other terms while related may imply different procedures or include some level of ceremony or delay. Interment refers generally to the act of placing a body in a grave or tomb, which could be accompanied by a ceremony. Immediate burial might suggest urgency but does not explicitly convey the absence of any viewing or formal service, while simplified burial could imply a less complex arrangement but may still involve certain rituals. Thus, direct burial is the most precise term for the scenario described in the question.