descensive
/dɪˈsɛnsɪv/adjective
Having the quality of descending (literal and figurative ); characterized by downward movement or tendency. Opposed to ascensive. Now somewhat rare.
Origin
Late Middle English; earliest use found in Guy de Chauliac's Grande Chirurgie. From post-classical Latin descensivus (in music, of pitch) descending, having the quality of descending from classical Latin dēscēns-, past participial stem of dēscendere + -ivus.