indispensable

adjectives

not to be dispensed with; essential
"foods indispensable to good nutrition"
is derived from
is derived from
antonym
is similar to
urgently needed; absolutely necessary
"a critical element of the plan"; "critical medical supplies"; "vital for a healthy society"; "of vital interest"
see also
absolutely essential
is an attribute of
the quality possessed by something that you can get along without
absolutely necessary; vitally necessary
"essential tools and materials"; "funds essential to the completion of the project"; "an indispensable worker"
is derived from
is derived from
unavoidable
"the routine but indispensable ceremonies of state"
is similar to
morally or legally constraining or binding
"attendance is obligatory"; "an obligatory contribution"