[un.al.ter.able] adj (1611): not capable of being altered or changed "an ~ resolve" "~ hatred" -- un.al.ter.abil.i.ty n -- un.al.ter.able.ness n -- un.al.ter.ably adv
UNALTERABLE
Meaning of UNALTERABLE in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012