incorruptible (adj.)

• amaranthine
• deathless
• dependable
• everlasting
• frozen
• immortal
• imperishable
• impregnable
• indelible
• indestructible
• ineradicable
• inexpugnable
• inextinguishable
• invincible
• inviolable
• invulnerable
• proven
• quenchless
• reliable
• responsible
• straight
• sure
• tested
• tried
• true
• trustworthy
• trusty
• undestroyable
• undying
• unfading
• unquenchable