immoderately has 1 distinct synonym spread across 1 of its 2 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 moderately.
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.
without moderation; in an immoderate manner
“he eats immoderately”
to a degree that exceeds the bounds or reason or moderation
“his prices are unreasonably high”
Synonyms, antonyms and the broader and narrower relations for immoderately come from Princeton University’s WordNet. Full sources and licences.