crooked has 7 distinct synonyms spread across 3 of its 4 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 straight.
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.
having or marked by bends or angles; not straight or aligned
“crooked country roads”
irregular in shape or outline
“asymmetrical features”
Synonyms, antonyms and the broader and narrower relations for crooked come from Princeton University’s WordNet. Full sources and licences.
having the back and shoulders rounded; not erect
“a little oldish misshapen stooping woman”