The word "nonarticular" refers to something that is not related to a joint or its articulation. Some antonyms for this term include "articular," "jointed," "mobile," and "flexible." These words are often used when referring to parts of the body that are connected by joints, such as the knees, elbows, and shoulders. Alternatively, nonarticular can be replaced by the words "immobile," "rigid," or "fixed," which are antonyms indicating that something is not capable of movement or flexibility. Furthermore, "inflexible," "stiff," and "unyielding" can also be used as antonyms of nonarticular to describe something that does not bend or move easily.