indispensable

Indispensable is a strong adjective for something that you couldn't do without. If you have asthma and you're packing for summer vacation, your inhaler is indispensable, unless you enjoy gasping on the beach.

Something that is dispensable is something you could get rid of, like that box of yogurt-covered zucchini snacks that's been in the pantry for a year. So if something is indispensable you couldn't possibly go without it, like salt, or for some people, coffee. Chocolate is indispensable for chocolate chip cookies, as is furniture for the adult hide-and-go-seek league.

Definitions of indispensable
  1. adjective
    not to be dispensed with; essential
    “foods indispensable to good nutrition”
    Synonyms:
    critical, vital
    urgently needed; absolutely necessary
    necessary
    absolutely essential
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    Antonyms:
    dispensable
    capable of being dispensed with or done without
    unnecessary, unneeded
    not necessary
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  2. adjective
    absolutely necessary; vitally necessary
    “an indispensable worker”
    synonyms: essential
    necessary
    absolutely essential
  3. adjective
    unavoidable
    “the routine but indispensable ceremonies of state”
    Synonyms:
    obligatory
    morally or legally constraining or binding
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