coiled has no recorded synonym. 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 uncoiled.
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.
curled or wound (especially in concentric rings or spirals)
“a coiled snake ready to strike”
Synonyms, antonyms and the broader and narrower relations for coiled come from Princeton University’s WordNet. Full sources and licences.