Webster's Revised Unabridged Dictionary · 1913

Indelible

Indelible , adjective

[Latin indelebilis; pref. in- not + delebilis capable of being destroyed: compare French indélébile. See In- not, and Deleble.]

1.
That can not be removed, washed away, blotted out, or effaced; incapable of being canceled, lost, or forgotten; as, indelible characters; an indelible stain; an indelible impression on the memory.
2.
That can not be annulled; indestructible. [Rare]
They are endued with indelible power from above. — Sprat
Indelibly stamped and impressed. — J. Ellis
Collocations (2)
Indelible colors , fast colors which do not fade or tarnish by exposure.
Indelible ink , an ink not obliterated by washing; esp., a solution of silver nitrate.