а что, с гуглом совсем никак? Секунд за десять находится http://idioms.thefreedictionary.com/there%27s+no+tellingthere's no telling also there is no tellingit is impossible to guess There's no telling how much damage has been done to young people by these “designer drugs.” Even when we don't let them loose, there's no telling what kind of trouble the puppies will get into.