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being indispensable

absolutely essential

an indispensable duty

to a vital degree

the degree of indispensability

an indispensable implement

a necessary or essential thing

an indispensable means

vitally important

vitally important

the degree of necessity

have need of

anything indispensable

to adhere to unessentials

crucially important

anything that is not essential

the level of needlessness

necessity of matter (be unnecessary)

an omission of a necessary matter

to be necessary

in great necessity

the essential factor

necessity

an essential item

of paramount importance

without any necessity

of vital importance

a condition of being unnecessary

without need

unnecessary