lowness has 6 distinct synonyms spread across 2 of its 4 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 highness.
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.
a position of inferior status; low in station or rank or fortune or estimation
Synonyms, antonyms and the broader and narrower relations for lowness come from Princeton University’s WordNet. Full sources and licences.
a low or small degree of any quality (amount or force or temperature etc.)
“he took advantage of the lowness of interest rates”