The Collaborative International Dictionary
Indelible \In*del"i*ble\, a. [L. indelebilis; pref. in- not + delebilis capable of being destroyed: cf. F. ind['e]l['e]bile. See In- not, and Deleble.] [Formerly written also indeleble, which accords with the etymology of the word.]
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.
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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 not obliterated by washing; esp., a solution of silver nitrate.
Syn: Fixed; fast; permanent; ineffaceable. -- In*del"i*ble*ness, n. -- In*del"i*bly, adv.
Indelibly stamped and impressed.
--J. Ellis.
Wiktionary
n. Quality of being indelible.