Technology will vary on a field-by-field basis. Our experiences in the wars made possible significant advances in aeronautics, medicine (especially surgery), electronics, nuclear technology, rocketry, mass production, and material science. There were a great many university students lost in World War I and the Haber process was already having an impact on certain priorities. Without the economic bubble there is likely no Depression also, so economics might be wildly different or much more pre-Keynesian in this case. Recording technology and magnetic tapes might take much longer to come around so LPs would dominate as they did in the 1960s, but transistors might not be around yet (or introduced 20 years earlier via the Russians?).
Russia probably never goes Communist and might in fact be a monarchy at that time, it will also command a significant lead in many scientific areas but remain far less industrialized. Russia will also have a much larger Jewish population and Israel probably dies not exist, but then nor would many of the Middle Eastern nations as we know them. Communists would still be viewed as radicals and global socialism will still exist though social progress will be retarded significantly without the experiences of women working the jobs the men leave behind and the minorities participating in a war for a society that frankly neglects them at best. Much of the United States will be significantly less developed and more agricultural, especially in the South and West Coast. Europe will remain the hub of technology and power with Japan rising and China probably akin to the United States though possibly a shattered confederacy of warlord states. Colonialism is less developed as Europe still looks as strong as ever, so there might be 50 countries around the world instead of 200. English is a major trade language, but so is German, French, Spanish, Chinese, Russian, and Arabic. Germany is likely still a leader in medicine and biology as well as chemistry and physics. There will be fewer social safety nets, more religious conservatism, a more divided United States, and probably a lot less material comfort for the average person even in the "first world" countries.
I would expect a brushfire war or two, perhaps Italy assaulting Ethiopea or Japan fighting China, but a world where the last global conflict would have been in the Napoleonic era would be a very different place. Fashion would be hard to predict but music is probably much more conservative, maybe swing music fuses with elements of gospel and jazz to create a very lively form of dance. Alternatively too a lot of the people who died in the First World War might make truly monumental discoveries, it would be difficult to ascertain exactly who might take what how far. Synthetics will still likely emerge, especially as Waldo Semon and others would already be working, and anything commercially driven would still advance. Workplace safety rules would be behind as organized labor might look Marxist. Frankly it would not be a world I would want to visit for very long...