tenured
adamant
adamantine
at a standstill
firm
fixed
frozen
immobile
immotile
immotive
immovable
inflexible
pat
permanent
rigid
standpat
stationary
steadfast
unmovable
unmoving
unyielding
Ciceronian
absum
adversis
antinational
blood-brain
choiceless
closemouthed
destructible
inconvertible
inerrable
irresistable
never-varying
overscrupulous
photosynthetic
pro-german
self-existent
self-originated
self-perpetuating
tauto
unchangeable
under-valued
undestroyed
unmanifest
veneranda