One of the benefits of having a word for something is that one can talk about it without talking around it. For example, the ancient Greeks had no word for 'velocity' and so could not easily discuss the physics of local motion. Not that they were unaware that things changed location at various rates, but they simply called it 'motion.' A constant velocity was said to exhibit uniform motion, that is, it's motion had a single form. Acceleration, by which a thing took on successively greater forms of motion, was call difform motion. But that's as far as they took it. Terms like 'velocity,' 'instantaneous velocity,' and the like awaited the Middle Ages. So did terms like 'numerator' and 'denominator,' which you kinda need to speak of velocity intelligibly.
Thing is, the ancients (and early medievals) were interested in motion as such, more so than in its magnitude, so they wondered how a thing might move at all rather than in how one would describe that motion arithmetically, and their vocabulary reflects this. We Moderns are just as hobbled when we try to talk about love, since the distillation of modern English boils everything down pretty much to plumbing. The fine distinctions of eros, agape, philos, and the like are not for the blunt Modern ear, which just wants to know if she is available and if so, how soon.
Of the words on the list linked to above, the one that seems most keenly wanted is:
Backpfeifengesicht (German): A face badly in need of a fistSimply to define the word conjures up many needful applications.
OTOH, only in German would that even qualify as a single word....
Your task, should you decide to accept it, is to create word badly needed by the English language and give its definition. The word should be eminently plausible. It may even be an actual foreign word!
An eager world awaits your contribution.