indispensable
/ˌɪndɪˈspɛnsəbəl/ adjective B2- Absolutely necessary or requisite; that one cannot do without. · An indispensable component of a heart-healthy diet.
- Unbendable, that cannot be set aside or ignored.
From the library
Mycroft draws four hundred and fifty pounds a year, remains a subordinate, has no ambitions of any kind, will receive neither honour nor title, but remains the most indispensable man in the country.”
“Then,” said he, “you are ready to pay the official visits, which are absolutely indispensable?”
“They were indispensable.”
“Ah, perbacco, indispensable, were they?”
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