semperidentical

Etymology
.

Adjective

 * 1)  Remaining always the same; unvarying with the passage of time.
 * 2) * 1820–1847: [aut.] and  [ed.], Essays and Criticisms, page 98 (1880 publication)
 * That perfectly semperidentical display of idiosyncratic egotism which runs through…all his varieties.