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imperceptible has 1 distinct synonym spread across 1 of its 1 sense. 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 perceptible.
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.
impossible or difficult to perceive by the mind or senses
“an imperceptible drop in temperature”
Synonyms, antonyms and the broader and narrower relations for imperceptible come from Princeton University’s WordNet. Full sources and licences.