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sterile has 6 distinct synonyms spread across 3 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 fertile.
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.
free of or using methods to keep free of pathological microorganisms
“a sterile operating area”
deficient in originality or creativity; lacking powers of invention
“a sterile ideology lacking in originality”
Synonyms, antonyms and the broader and narrower relations for sterile come from Princeton University’s WordNet. Full sources and licences.