From WordNet (r) 3.0 (2006) [wn]:
downwardly
adv 1: spatially or metaphorically from a higher to a lower
level or position; "don't fall down"; "rode the lift up
and skied down"; "prices plunged downward" [syn: down,
downwards, downward, downwardly] [ant: up,
upward, upwardly, upwards]