An adjective glossed “drooping, ailing” in notes probably from around 1959 based on the strengthened form of the root √(N)DIP “drooping” (PE17/168). For purposes of Neo-Quenya, I would assume this word applies to those who currently feel weak or ill but may or may not be actually sick.
Quenya
nimpa
drooping, ailing
nimpa
adjective. drooping, ailing
nimpa adj. "drooping, ailing" (PE17:168)