IELTS Anvil

indispensable

CEFR: C1

Absolutely necessary, essential, and impossible to do without in an engineering project or public institution.

Synonyms

essential
vital
imperative

Common Collocations

indispensable tool
indispensable part
prove indispensable

Example Sentence

Submarine telegraph cables became indispensable infrastructure for coordinate diplomatic messaging and international trade.

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