no reformnation or stronger and more succesfull counterreformation would help
a stronger, longerstanding set of apsolutist monarchies
french revolution killed off by forein reactionary forces
stronger cultural hegemony, with religion being more important and near total media control by the state
basically apsolutist monarchy surviving WWI like the japanese one did, olnly with a biger piece of the cake going to "midlle class" nobility, to keep them from going all civil war every couple of decades, or just parliamentary monarchies, in a world without the french revolution this would mean feudal noblemen as members of parliament and some religious representatives, with practicaly no regard for the citisens, or representation of same, but a lot of taxation
you shouldnt worry about modernity much, the economy would be somewhat diferent but technology would be more or less the same, olnly the whole mass use, user friendly thing would not be as widespread, that is not so much popular consumerism, for instance no personal computers, but still a wide network of big supercomputers and many smaller ones owned and controled by the monarchy or some other entity within the establishment
generaly less desing and less refined industrial products, exept for the military, wich would get the most of the industrial effort and the best of all industrial products
all this would take a huge effort to maintain the military and the propaganda machine to keep the ordinary citizens from revolting after technology advances enough to give them the means to inform themselwes and eficiently opose the goverment
another less happy scenario would be some kind of balkanification of large world regions, leaving a lot of small feudal states in constant competition with each other, each with a sistem to small to create the posibility of an eficient revolution, but all together creating a complex sistem that alows for economic and technological development, while still keeping the people in ignorance and serfdom
religion would play a big role in a world like this