Acondylous is a scientific term that refers to a condition where an organism's limbs lack joints or hinge-like structures. Synonyms for acondylous include jointless, immovable, inflexible, rigid, stiff, unarticulated, and unbending. These words all describe the same characteristic of a lack of movement in limbs due to the absence of joints. Acondylous organisms can be found across various phyla, including some types of worms, insects, and arachnids. While having jointless limbs can limit mobility, some acondylous species are still able to move and thrive in their environments. Understanding these synonyms can help scientists communicate more clearly about specific characteristics of different organisms.