REPLACEABLE Antonyms

• of extreme importance; vital to the resolution of a crisis

• having crucial relevance

• of the greatest importance

• basic and fundamental

• being or relating to or containing the essence of a plant etc

• defining rights and duties as opposed to giving the rules by which rights and duties are established

• anything indispensable

• absolutely necessary; vitally necessary

• of the greatest importance

• not to be dispensed with; essential

• absolutely necessary; vitally necessary

• unavoidable

• absolutely essential

• anything indispensable

• unavoidably determined by prior circumstances

• continuing or enduring without marked change in status or condition or place

• a series of waves in the hair made by applying heat and chemicals

• not capable of being reversed or returned to the original condition

• having incalculable monetary, intellectual, or spiritual worth

• radically distinctive and without equal

• (followed by `to') applying exclusively to a given category or condition or locality

• the single one of its kind

• highly unusual or rare but not the single instance

• having great material or monetary value especially for use or exchange

• something of value

• having worth or merit or value

• urgently needed; absolutely necessary

• performing an essential function in the living body

• full of spirit; full of life

• manifesting or characteristic of life