volatile Antonyms

nonvolatile driven in step by step unaired unchangeable unchanging unceasing strong steady steadfast stationary static nonvolatilizable unventilated 24-7 deeply ingrained deeply implanted deeply fixed deeply entrenched deeply embedded deeply rooted very upset unvarying deep-seated deep-rooted bred-in-the-bone stable settled enduring dependable deep constant compassionate charitable changeless certain calm black letter benevolent engrained even firm reliable predictable persistent permanent lasting invariable inexpugnable ineffaceable