A neologism coined by Helge Fauskanger in his NQNT (NQNT), an adjectival form of Q. málë “good health”.
Quenya
málë
noun. good health
málëa
adjective. healthy, healthful
polëa
adjective. able
alwa
healthy, strong, flourishing
[alwa adj. "healthy, strong, flourishing" (+ one gloss not certainly legible: ?"well grown") (VT45:14)]
polië
noun. ability
A noun for “good health” in Definitive Linguistic Notes (DLN) from 1959, based on the root √MAGA “to thrive, be in a good state” (PE17/162).