Word parts un- + countable Pronunciation IPA (key): /ʌnˈkaʊntəbəl/ Audio (UK)(file) Hyphenation: un‧count‧able Adjective Positive uncountable Comparative none Superlative none (grammar) A word is uncountable if it means something that there is not a set number of. This usually means that it names a substance like water or wood. Uncountable words are sometimes called mass nouns, and they cannot be plural. Antonym: countableWikiwand - on Seamless Wikipedia browsing. On steroids.