ineffaceable
UK[ˌɪn.ɪˈfeɪ.sə.bəl]US[ˌɪn.əˈfeɪ.sə.bəl]
adj
impossible to erase or remove; permanent.
adj
making a lasting impression that cannot be forgotten.
Morpheme Breakdown
in
efface
able
in
not
efface
erase
able
capable of
Etymology
the word 'ineffaceable' is built upon the french verb 'effacer', which literally meant 'to remove the face or surface' of something, derived from the latin elements 'ex-' (out) and 'facies' (form, appearance, face). the negative prefix 'in-' (not) was added to create the opposite meaning, and the productive suffix '-able' (capable of being) was appended to form an adjective. thus, the literal construction "not capable of being erased from the surface" evolved into its modern abstract sense of something so permanent or deeply impressed that it cannot be removed or forgotten.
Analysis
Structure: in (not) + efface (erase) + able (capable of)
in- (latin origin, a prefix meaning 'not'); efface (from french 'effacer', meaning 'to erase', itself from latin 'ex-' (out) + 'facies' (face, appearance)); -able (latin suffix '-abilis', forming adjectives meaning 'capable of, fit for').
Examples
the memory of that day left an ineffaceable mark on her mind.
the treaty aimed to create an ineffaceable boundary between the two nations.
his kindness during the crisis was an ineffaceable act of courage.