permanent Synonyms

durable lasting everlasting constant unending enduring perm steady abiding stable endless unchanging settled steadfast fixed set unconditional undying strong substantive sure sustained tenacious timeless stiff stationary perpetual persisting persistent regular resistant reverseless rigid staying sedentary sempiternal infinite quiescent standing static permeant unfailing set in stone stabile nonreversible nonvolatile for good intransient unchanged age-long