Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Language: Medieval Latin
Origin: indelibilis, from Latin indelebilis, from delere; DELETE

indelible

 adjective
     
in‧del‧i‧ble
1 impossible to remove or forget [= permanent]:
Her words left an indelible impression on me for years to come.
2

indelible ink/pencil/marker etc

ink etc that makes a permanent mark which cannot be removed
—indelibly adverb:
a moment indelibly imprinted on my mind
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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