hard water hard up • hard wheat · · · Info · Definitions · Antonyms · Characters · · hard water · · Text Common · · Latin · · Scripts 10 · · Length 3 · · Syllables Definitions · · · (noun) water that contains mineral salts (as calcium and magnesium ions) that limit the formation of lather with soap. Synonyms: hard water. · · Noun Definition 1 Antonyms · · · soft water · · Antonym 0 Characters · · space U+0020 a latin small letter a U+0061 d latin small letter d U+0064 e latin small letter e U+0065 h latin small letter h U+0068 r latin small letter r U+0072 t latin small letter t U+0074 w latin small letter w U+0077