Synonyms for permanent

modified

1. Perpetual

   unchanging, continual, changeless; see perpetual 1.

2. Intended to last for a considerable time

   durable, enduring, abiding, uninterrupted, stable, continuing, unremitting, unremittent, lasting, perdurable, firm, hard, tough, strong, rocklike, hardy, robust, sound, sturdy, steadfast, imperishable, surviving, living, long-lived, long-standing, invariable, persisting, tenacious, persevering, unyielding, resisting, resistant, impenetrable, recurring, wearing, constant, changeless, holding, persistent, perennial.