'Indispensable' means absolutely necessary or essential, often used to describe people, tools, or skills that are crucial to the success of a project or task. Explore the term 'indispensable,' its definitions, origins, usage, synonyms, antonyms, and related terms. Understand what makes something or someone indispensable through examples and literature. The correct spelling is indispensable. The word “indispensable” means absolutely necessary or essential. It’s often used to describe something you cannot manage without. For example, in a sentence: “A good dictionary is indispensable for learning a new language.” Here, the dictionary is described as crucial because it helps understand and use words correctly. The meaning of INDISPENSABLE is absolutely necessary : essential. How to use indispensable in a sentence.