indispensable

Definitions

Absolutely necessary; essential.

Too important to be set aside or ignored.

Examples

A good dictionary is an indispensable tool for anyone learning a new language.

Trust is indispensable to the success of any long-term relationship.

In the modern world, a reliable internet connection has become absolutely indispensable.

Synonyms

essential crucial vital necessary required imperative fundamental

Antonyms

dispensable unnecessary optional nonessential superfluous needless expendable