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indispensable

/ˌɪndɪˈspensəbl//ˌɪndɪˈspensəbl/·adjective
absolutely necessary; impossible to do without
Fig. 1 — An arch of stones carries a heavy load, with one bright stone set at the very crown.
01Definition

Something indispensable cannot be dispensed with — remove it and the whole thing fails. From the Latin dispensare, 'to do without', with the negating in-: the indispensable worker whose absence stops the line, the indispensable vitamin without which the body breaks down. It marks the load-bearing part, the keystone. This is the exact opposite of redundant: where a redundant element can be cut with no effect, an indispensable one is the single piece on which all the rest depends — paramount to the structure.

02In use
  • iClean water is indispensable to public health.
  • iiOver the years she made herself indispensable to the company.
  • iiiBees play an indispensable role in pollinating the crops we depend on.
03Collocations
  • absolutely indispensable
  • an indispensable role
  • indispensable to
  • prove indispensable

Family indispensability (noun) · indispensably (adverb)

04Relations

=essential, vital, crucial, necessary, requisite

≠redundant, dispensable, unnecessary

05Compared
PairThe difference
indispensable vs inevitablecannot be done without, nothing else will serve → indispensable; cannot be avoided, certain to happen → inevitable.
06TOEFL & IELTS

A strong upgrade over 'very important' in IELTS Writing: 'an indispensable role/tool/resource'. TOEFL passages use it for keystone species, essential nutrients, and pivotal historical figures. Mind the preposition — indispensable *to* something or someone. Its precise antonym 'dispensable' (and 'redundant') is worth pairing with it, since reading questions often test the contrast.

07Asked
Is it 'indispensable' or 'indispensible'?
Indispensable, with an a — 'indispensible' is a common misspelling. The word is built on 'dispensable', which also takes -able, so if you can dispense with something it is dispens-able, and if you cannot, it is in-dispens-able. When in doubt, spot the whole word 'dispensable' inside it and keep the a.
What is the difference between indispensable and essential?
They are close, with indispensable the stronger. Essential means necessary, part of the core. Indispensable means you literally cannot do without it — remove it and the whole thing fails. The scene above draws the line: an ordinary stone lifted from the arch and nothing happens, but pull the keystone and every stone drops. The keystone is indispensable.
Is it 'indispensable to' or 'indispensable for'?
Both are correct, split by what follows. Use 'to' before a person or thing that depends on it ('indispensable to the team', 'indispensable to life'). Use 'for' before a purpose or activity ('indispensable for research', 'indispensable for survival'). To marks who cannot do without it; for marks what it is needed to do.
What is the opposite of indispensable?
Dispensable — something you can do without, that can be cut with no real loss. Redundant is close, meaning surplus to requirements. The scene above shows the difference in a single test: the dispensable stone leaves the arch and it stands unchanged. Reading exams often pair indispensable with dispensable, since the contrast is so clean.
What does 'make yourself indispensable' mean?
To become so useful that your absence would cause real trouble — the career advice that you should be the person a team cannot easily replace. It uses the word's core sense: to be indispensable is to be load-bearing, the piece the rest depends on. The caution behind the advice is that the truly indispensable can also be hard to promote.
What does indispensable mean?
Absolutely necessary — impossible to manage without. An indispensable tool, worker, or nutrient is the one whose removal makes the whole thing break down, not merely run less well. It marks the load-bearing part, the keystone rather than the decoration. That is what separates it from 'useful' or even 'important': lose the indispensable, and everything else fails with it.