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Uncountable noun

A noun which has no plural form and cannot normally be used with the article a/an.

Examples are: mud, rudeness, wheat, water, furniture etc.

Uncountable (or mass) nouns are the names of materials, liquids, abstract qualities, collections and other things which we see as masses without clear boundaries, and not as separate objects.

Note that not all nouns are either simply countable or uncountable. Many nouns have both countable and uncountable uses, sometimes with a difference of meaning.