From Longman Dictionary of Contemporary Englishindispensablein‧di‧spen‧sa‧ble /ˌɪndɪˈspensəbəl◂/ ●○○ adjective NEEDUSEFULsomeone or something that is indispensable is so important or useful that it is impossible to manage without them SYN essentialindispensable to This book is indispensable to anyone interested in space exploration.indispensable for/in (doing) something Meat is not indispensable for maintaining a healthy diet. Mobile phones have become an indispensable part of our lives.► see thesaurus at useful
Examples from the Corpus
indispensable• For mountain-climbing a really good sleeping-bag is indispensable.• If you're planning on going sightseeing around the old city, a guide is indispensable.• Police dogs have proved indispensable in the war on drugs.• She soon became an indispensable member of staff.• A knowledge of classical music is indispensable to anyone who wants to apply for this job.• The book will be indispensable to anyone who wishes to learn more about the British Royal Family.indispensable for/in (doing) something• And a high level of production is indispensable for economic security.• Nicoletta has become by now indispensable for my life.• But it will be indispensable for social equilibrium in a world which so far remains fundamentally capitalist.• However they were not indispensable for that purpose.• The process favors, is even indispensable for, the development of a national bourgeois state.• The exactitude and measure of structural engineering has been indispensable for the development of my work.• Having regard to future possibilities as well as present realities, an exclusion clause would be indispensable in the new system. 