Quenya 

alfirin

adjective. immortal

Quenya [PE 22:156] Group: Mellonath Daeron. Published by

ilfirin

immortal

ilfirin adj. "immortal" (PHIR)

alfírima/alfírimo

immortal

Quenya [PE 22:124] Group: Mellonath Daeron. Published by

ilpirin

immortal

*ilpirin (hypothetical form; the word actually appears in Q as ilfirin) adj. "immortal" (PHIR)