Adjective
non-count (not comparable)
(grammar) Uncountable.
Mass nouns or uncountable (or non-count) nouns differ from count nouns in precisely that respect: they cannot take plurals or combine with number words or the above type of quantifiers. Source: Internet
Meanwhile, German has a general word for "vegetables" that, like English "fruit", is (usually) non-count: das Gemüse. Source: Internet
The objects that these words describe are, objectively speaking, similar (that is, they're all edible plant parts); yet the word "fruit" is (usually) non-count, whereas "vegetables" is a plural count form. Source: Internet