This is a typical family conversation over lunch
dad: "What does disingenuous mean?"
me: "its the opposite of genuining yourself at someone"
dad glowers at me and looks imploringly at mom
mom: "I am not sure of the exact definition, but is obviously the opposite of 'ingenuous'"
dad:"i know, but what does 'ingenuous' mean?"
me: "i've got the dictionary! ok now....pigeon....lemur...."
dad: "disingenuous starts with a d, honey. d-i-s-"
me: "I know! i am getting there! diving bell...ha ha ha, diving bell.....display...., ok! 'disingenuous: being not straightforward, not frank, candid'....etc. see! i told you! the opposite of genuining yourself at someone! oh and 'lying'. oh, its like obfuscate!"
mom:"now what is that?"
me: "well, actually it is obscuring something, like the truth. ooo! a disingenuous obfuscation! oh wait! that's a double negative"
me: "so that would be something that wasn't very good at obscuring, like a sheer nightie, or a light denier stocking, you can still see everything through them!"
watch out for those disingenuous obfuscations, they'll come to get you one day, likely when you are wearing a white t-shirt.