Undeclinable Words: The Building Blocks of Sentences

In linguistics, an undeclinable word is a word that does not inflect for grammatical case or number. In other words, it does not change form to indicate its function in a sentence.

For example, in English, the word "dog" is undeclinable because it does not change form to indicate whether it is the subject or object of a sentence. It remains the same regardless of its function in the sentence.

In contrast, declinable words, such as "the cat" or "the dogs," do inflect for grammatical case and number, indicating their function in the sentence.

Undeclinable words are common in many languages, including English, and often serve as the basic building blocks of sentences. They can be combined with other words to form phrases and clauses, which can then be used to create more complex sentences.