downsloping adjective 1noun 1forms 2 adjective1 •Sloping downward.With seats folded or erect, the downsloping roof impinges on cargo capacity; a Kia Spectra ’s hatch seems as big as an S.U.V.’s in comparison. — 2007 noun1 •Air descending a slope, resulting in adiabatic warming and reduction in relative humidity.Downsloping creates an environment that is far less conducive to thunderstorms[…] — 2005 formsmore downsloping · most downsloping