kaput
Synonym discussion
Sense: adjective/1
Broken is the broad neutral word and works for almost any object, from a mug to a printer. Kaput is more informal and usually suggests that something mechanical or electronic has failed so badly that it is useless for now. Dead is also informal, but it often points more specifically to a battery, screen, engine, or other device that has lost power. Busted is casual and slightly more American in flavour, often used when something is damaged or when a plan fails. Knackered is British informal like kaput, but it often hints that the object is worn out after a lot of use. You might tell a friend, 'My old laptop is kaput,' but in a repair report you would normally write 'broken' or 'not working'.
Common collocations
Etymology
English borrowed kaput from German kaputt, meaning broken or finished. English kept the same casual tone and now mainly uses kaput for machines or systems that have failed completely.