"hanging loosely or swinging freely from a fixed point above," c. 1600, from Latin pendulus "hanging down," figuratively "doubtful, uncertain, hesitating," from pendere "to hang" (from PIE root *(s)pen- "to draw, stretch, spin") + -ous. Related: Pendulously; pendulousness.
word-forming element making adjectives from nouns, meaning "having, full of, having to do with, doing, inclined to," from Old French -ous, -eux, from Latin -osus (compare -ose (1)). In chemistry, "having a lower valence than forms expressed in -ic."
<a href="https://www.etymonline.com/word/funipendulous">Etymology of funipendulous by etymonline</a>
Harper, D. (n.d.). Etymology of funipendulous. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/funipendulous