What does "indelible" mean?

Indelible: That can not be annulled; indestructible. [R.] They are endued with indelible power from above. Sprat. Indelible colors, fast colors which do not fade or tarnish by exposure. -- Indelible ink, an ink obliterated by washing; esp., a solution of silver nitrate. -- In*del"i*ble*ness, n. -- In*del"i*bly, adv. Indelibly stamped and impressed. J. Ellis.