1. impossible to remove, erase, or wash away
2. making a lasting impression; unforgettable
Usage: figurative

Examples

• She wrote her name with an indelible marker.
• The ink left an indelible stain on his shirt.
• The tragedy left an indelible mark on the community.
• His childhood memories of the farm were indelible.
• The artist used indelible paint for the outdoor mural.
• Her first day of school made an indelible impression on her.
• The contract was signed in indelible ink.