not have the foggiest notion

to not know anything at all about something not have the faintest idea I don't have the foggiest notion what that book is about.

Name	Pronounced	Usage
Mehmood	-	Urdu
Sushila	-	Hinduism, Indian, Hindi, Marathi, Nepali
Annalisa	-	Italian
EnikŐ	-	Hungarian
Milica	MEE-lee-tsah (Serbian, Croatian)	Serbian, Croatian, Slovene, Macedonian
Aderyn	-	Welsh