The term 'untouchable' is used to describe something that is not allowed to be changed or interfered with. DERELICT (8 letters) means abandoned or neglected, SACROSANCT (10 letters) means inviolable or SACRED, SHUNNED (7 letters) means avoided or kept away from, SACRED (6 letters) means holy or revered, IMMUNE (6 letters) means protected or invulnerable, SAFE (4 letters) means secure or protected, TOXIC (5 letters) means poisonous or harmful, and sacredcow (9 letters) means an idea or practice that is not to be questioned. All of these words can be used to describe something that is untouchable, meaning it is not to be interfered with or changed.