The phrase "utter inability" means a complete and total lack of capability or power to do something. It describes a state where someone cannot do or perform a particular action at all. Full definition
Special mention has to be given to the Met's own «dodgy geezer», John Yates, whose utter inability to realise he was dropping himself in it provided a jaw - dropping three hours for incredulous MPs on the home affairs committee. (politics.co.uk)
They were enjoying a degree of liberty never before accorded to young women, and they were betraying their utter inability to handle it. (religion-online.org)
Other fred, seems like your god has an utter inability to execute on his plans. (religion.blogs.cnn.com)