indispensable

US /ˌɪn.dɪˈspen.sə.bəl/

UK /ˌɪn.dɪˈspen.sə.bəl/

1.

absolutely necessary

:

•

Water is indispensable for life.

•

A good dictionary is indispensable for language learners.

:

essential crucial vital necessary required

:

dispensable unnecessary superfluous expendable