wild has 29 distinct synonyms spread across 13 of its 17 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 tame.
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.
marked by extreme lack of restraint or control
“wild talk”
without a basis in reason or fact
“baseless gossip”
without civilizing influences
“barbarian invaders”
(of the elements) as if showing violent anger
“angry clouds on the horizon”
a wild primitive state untouched by civilization
“he lived in the wild”
a wild and uninhabited area left in its natural condition
“it was a wilderness preserved for the hawks and mountaineers”
3 of the 17 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 wild.
Synonyms, antonyms and the broader and narrower relations for wild come from Princeton University’s WordNet. Full sources and licences.