What's the difference between
and
Enter two words to compare and contrast their definitions, origins, and synonyms to better understand how those words are related.

Cannot vs Fail - What's the difference?

cannot | fail |

As verbs the difference between cannot and fail

is that cannot is can not (am/is/are unable to) while fail is to be unsuccessful.

As nouns the difference between cannot and fail

is that cannot is something that cannot be done while fail is poor quality; substandard workmanship.

As an adjective fail is

that is a failure.

cannot

English

Verb

(head)
  • not (am/is/are unable to).
  • Am/are/is forbidden or not permitted to
  • * 1668 December 19, , “Mr.'' Alexander Seaton ''contra'' Menzies” in ''The Deci?ions of the Lords of Council & Se??ion I (Edinburgh, 1683), page 575
  • The Pupil after his Pupillarity, had granted a Di?charge to one of the Co-tutors, which did extingui?h the whole Debt of that Co-tutor, and con?equently of all the re?t, they being all correi debendi , lyable by one individual Obligation, which cannot be Di?charged as to one, and ?tand as to all the re?t.
  • * {{quote-magazine, date=2013-06-21, author= Karen McVeigh
  • , volume=189, issue=2, page=10, magazine=(The Guardian Weekly) , title= US rules human genes can't be patented , passage=The US supreme court has ruled unanimously that natural human genes cannot be patented, a decision that scientists and civil rights campaigners said removed a major barrier to patient care and medical innovation.}}
    Usage notes
    Both the one-word form cannot' and the two-word form '''can not''' are acceptable, but '''cannot''' is more common (in the , three times as common). The two-word form is better only in a construction in which '''not is part of a set phrase, such as 'not only... but (also)': ''Paul can not only sing well, but also paint brilliantly .

    Synonyms

    * can't

    Noun

    (en noun)
  • Something that cannot be done.
  • the cans and cannots

    Statistics

    *

    fail

    English

    Verb

    (en verb)
  • (label) To be unsuccessful.
  • * {{quote-magazine, date=2013-08-10, volume=408, issue=8848, magazine=(The Economist)
  • , title= A new prescription , passage=As the world’s drug habit shows, governments are failing in their quest to monitor every London window-box and Andean hillside for banned plants. But even that Sisyphean task looks easy next to the fight against synthetic drugs. No sooner has a drug been blacklisted than chemists adjust their recipe and start churning out a subtly different one.}}
  • (label) Not to achieve a particular stated goal. (Usage note: The direct object of this word is usually an infinitive.)
  • (label) To neglect.
  • To cease to operate correctly.
  • (label) To be wanting to, to be insufficient for, to disappoint, to desert.
  • * Bible, 1 Kings ii. 4
  • There shall not fail thee a man on the throne.
  • * 1843 , (Thomas Carlyle), '', book 3, ch. II, ''Gospel of Mammonism
  • A poor Irish Widow […] went forth with her three children, bare of all resource, to solicit help from the Charitable Establishments of that City. At this Charitable Establishment and then at that she was refused; referred from one to the other, helped by none; — till she had exhausted them all; till her strength and heart failed her: she sank down in typhus-fever […]
  • *
  • , title=The Mirror and the Lamp , chapter=2 citation , passage=That the young Mr. Churchills liked—but they did not like him coming round of an evening and drinking weak whisky-and-water while he held forth on railway debentures and corporation loans. Mr. Barrett, however, by fawning and flattery, seemed to be able to make not only Mrs. Churchill but everyone else do what he desired. And if the arts of humbleness failed him, he overcame you by sheer impudence.}}
  • (label) To receive one or more non-passing grades in academic pursuits.
  • (label) To give a student a non-passing grade in an academic endeavour.
  • To miss attaining; to lose.
  • * Milton
  • though that seat of earthly bliss be failed
  • To be wanting; to fall short; to be or become deficient in any measure or degree up to total absence.
  • The crops failed last year.
  • * Bible, Job xiv. 11
  • as the waters fail from the sea
  • * Shakespeare
  • Till Lionel's issue fails , his should not reign.
  • (archaic) To be affected with want; to come short; to lack; to be deficient or unprovided; used with of .
  • * Berke
  • If ever they fail of beauty, this failure is not be attributed to their size.
  • (archaic) To fall away; to become diminished; to decline; to decay; to sink.
  • * Milton
  • When earnestly they seek / Such proof, conclude they then begin to fail .
  • (archaic) To deteriorate in respect to vigour, activity, resources, etc.; to become weaker.
  • A sick man fails .
  • (obsolete) To perish; to die; used of a person.
  • * Shakespeare
  • had the king in his last sickness failed
  • (obsolete) To err in judgment; to be mistaken.
  • * Milton
  • Which ofttimes may succeed, so as perhaps / Shall grieve him, if I fail not.
  • To become unable to meet one's engagements; especially, to be unable to pay one's debts or discharge one's business obligation; to become bankrupt or insolvent.
  • Usage notes

    * This is a catenative verb which takes the to infinitive . See

    Synonyms

    * (to be unsuccessful) fall on one's face

    Antonyms

    * (to be unsuccessful) succeed

    Derived terms

    * failure * fail-safe

    Noun

  • (uncountable) (label) Poor quality; substandard workmanship.
  • The project was full of fail .
  • (label) A failure (condition of being unsuccessful)
  • A failure (something incapable of success)
  • A failure, especially of a financial transaction (a termination of an action).
  • A failing grade in an academic examination.
  • Adjective

    (en adjective)
  • That is a failure.
  • References

    * * *