absolutely required and not to be used up or sacrificed
absolutely necessary; vitally necessary; "essential tools and materials"; "funds essential to the completion of the project"; "an indispensable worker"
being or relating to or containing the essence of a plant etc; "essential oil"
the act of demanding; "the kidnapper's exorbitant demands for money"
an urgent or peremptory request; "his demands for attention were unceasing"
the ability and desire to purchase goods and services; "the automobile reduced the demand for buggywhips"; "the demand exceeded the supply"
request urgently and forcefully; "The victim's family is demanding compensation"; "The boss demanded that he be fired immediately"; "She demanded to see the manager"
claim as due or just; "The bank demanded payment of the loan"
a small valley between mountains; "he built himself a cabin in a hollow high up in the Appalachians"
a cavity or space in something; "hunger had caused the hollows in their cheeks"
as if echoing in a hollow space; "the hollow sound of footsteps in the empty ballroom"
not solid; having a space or gap or cavity; "a hollow wall"; "a hollow tree"; "hollow cheeks"; "his face became gaunter and more hollow with each year"
a thin layer covering something; "a second coat of paint"
a heavy fabric suitable for coats
a decorative texture or appearance of a surface (or the substance that gives it that appearance); "the boat had a metallic finish"; "he applied a coat of a clear finish"; "when the finish is too thin it is difficult to apply evenly"
(often followed by `of') not knowing or expecting; not thinking likely; "an unsuspecting victim"; "unsuspecting (or unaware) of the fact that I would one day be their leader"
not suspicious; "deceiving the unsuspecting public"
not wise in the ways of the world; "either too unsophisticated or too honest to promise more than he could deliver"; "this helplessly unworldly woman"- Kate O'Brien