infuse has 5 distinct synonyms spread across 3 of its 5 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
fill, as with a certain quality
“The heavy traffic tinctures the air with carbon monoxide”
Synonyms, antonyms and the broader and narrower relations for infuse come from Princeton University’s WordNet. Full sources and licences.
undergo the process of infusion
“the mint tea is infusing”
introduce into the body through a vein, for therapeutic purposes
“Some physiologists infuses sugar solutions into the veins of animals”