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infectious has 1 distinct synonym spread across 1 of its 3 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 noninfectious.
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.
caused by infection or capable of causing infection
“viruses and other infective agents”
easily spread
“fear is exceedingly infectious; children catch it from their elders”
1 of the 3 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for infectious.
Synonyms, antonyms and the broader and narrower relations for infectious come from Princeton University’s WordNet. Full sources and licences.