English
smileproof
From smile + -proof.
Formed from smile + -proof
Proto-Indo-European *smey- ‘to laugh’
…
Old High German smielēn
Middle High German smielen
Middle Low German *smîlen ‘to smile’
Middle English smilen ‘to smile’
English smile
Today it means
adj Unable to be charmed by a smile.
Language periods are conventional ranges, not dates for this word.
Etymograph / smileproof