ineffaceably

From ineffaceable +‎ -ly.

ineffaceably (comparative more ineffaceably, superlative most ineffaceably)

1. In an ineffaceable manner; in a manner that cannot be removed or erased.
   • 1855, Frederick Douglass, chapter III, in My Bondage and My Freedom. […], New York, Auburn, N.Y.: Miller, Orton & Mulligan […], →OCLC, part I (Life as a Slave), page 52:

     My knowledge of my mother is very scanty, but very distinct. Her personal appearance and bearing are ineffaceably stamped upon my memory.

• (in an ineffaceable manner): indelibly, permanently

• efface
• ineffaceable