broken has 13 distinct synonyms spread across 7 of its 13 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is unbroken.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
physically and forcibly separated into pieces or cracked or split
“a broken mirror”
not continuous in space, time, or sequence or varying abruptly
“broken lines of defense”
thrown into a state of disarray or confusion
“troops fleeing in broken ranks”
out of working order (`busted' is an informal substitute for `broken')
“a broken washing machine”
4 of the 13 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for broken.
Synonyms, antonyms and the broader and narrower relations for broken come from Princeton University’s WordNet. Full sources and licences.