English
lossproof
From loss + -proof.
Formed from loss + -proof
Proto-Indo-European *lews- ‘to cut’
Proto-Germanic *lusą ‘dissolution’
Proto-West Germanic *los
Old English los ‘damage’
Middle English los
English loss
Today it means
adj Resistant to losses.
Language periods are conventional ranges, not dates for this word.
Etymograph / lossproof