indispensable
adjective
1. not to be dispensed with; essential
- foods indispensable to good nutrition
Similar word(s): critical, vital, necessary
2. absolutely necessary; vitally necessary
- an indispensable worker
Similar word(s): necessary, essential
3. unavoidable
- the routine but indispensable ceremonies of state
Similar word(s): obligatory
Sentences with indispensable as an adjective:
- The law was moral and indispensable. -Bp. Burnet
- An indispensable component of a heart-healthy diet.
noun
1. A thing that is not dispensable; a necessity. [from 17th c.]
2. (in the plural, colloquial, dated) Trousers. [from 19th c.]