indispensable

Từ điển WordNet v3.1 - WordNet Dictionary

adjective

1. not to be dispensed with;
essential (Freq. 2)
- foods indispensable to good nutrition
• Ant:
dispensable
• Similar to:
critical, vital
• See Also:
necessary
• Derivationally related forms:
indispensableness, indispensability
• Attrubites:
dispensability, dispensableness
2. absolutely necessary;
vitally necessary (Freq. 1)
- essential tools and materials
- funds essential to the completion of the project
- an indispensable worker
• Syn:
essential
• Similar to:
necessary
• Derivationally related forms:
indispensableness, indispensability, essential (for: essential), essentialness (for: essential)
3. unavoidable
- the routine but indispensable ceremonies of state
• Similar to:
obligatory