Idiom: Not a spark of decency Posted on 21st June 201820th June 2018 by DoubleClick Not a spark of decency: a person who has no manners Example: You have to be careful with that person who does not have a spark of decency. Share this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window) Related Posted in Idiom and tagged Idiom N.