2. Adjective. So many as to be incapable of being counted. ¹
3. Adjective. (mathematics) Incapable of being put into one-to-one correspondence with the natural numbers or any subset thereof. ¹
4. Adjective. (grammar of a noun) Describes a meaning of a noun that cannot be used freely with numbers or the indefinite article, and which therefore takes no plural form. Example: ''information''. ¹
¹ Source: wiktionary.com
Definition of Uncountable
1. countable [adj] - See also: countable