smileproof

English

Etymology

From smile +‎ -proof.

Adjective

smileproof (comparative more smileproof, superlative most smileproof)

1. (informal, rare) Unable to be charmed by a smile.
   • 2012, Tom Holt, You Don't Have to Be Evil to Work Here, But It Helps:

     Another smile. If ever they got around to inventing the smileproof vest, a smile like that would present a very substantial challenge.

   • 2016, Gladys Malvern, Curtain Going Up!: The Story of Katharine Cornell:

     The Personage, his face schooled to stoniness, never under any circumstances responded to the smile—these were superior and smileproof beings.