/ ɪnˈdeləbl; NAmE / adjective
1.
impossible to forget or remove
SYN permanent :
The experience made an indelible impression on me.
Her unhappy childhood left an indelible mark.
2.
( of ink, pens, etc. ) leaving a mark that cannot be removed
SYN permanent :
an indelible marker
► in·del·ibly / -əbli; NAmE / adverb :
That day is stamped indelibly on my memory.
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WORD ORIGIN
late 15th cent. (as indeleble ): from French , or from Latin indelebilis , from in- not + delebilis (from delere remove, delete). The ending was altered under the influence of -ible .