If you experience failure, things have not gone the way you'd hoped. I'm sorry to hear that your attempt to turn hay into gold has been a failure.

Failure can also mean when something suddenly stops working or when you don't do something that you're expected to. A power failure might create an opportunity for a romantic candlelight dinner. Your failure to pay the electric bill may lead to a lot of romantic candlelight dinners, as long as you at least paid the gas bill. Someone who has no success in life a failure, as is an effort that doesn't work like your failure of a presidential campaign.

Definitions of failure
  1. noun
    an act that fails
    “his failure to pass the test”
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    failing, flunk
    failure to reach a minimum required performance
    complete failure
    the act of losing someone or something
    backsliding, lapse, lapsing, relapse, relapsing, reversion, reverting
    a failure to maintain a higher state
    error, misplay
    (baseball) a failure of a defensive player to make an out when normal play would have sufficed
    (baseball) a failure by a batter or runner to reach a base safely in baseball
    nonconformance, nonconformity
    failure to conform to accepted standards of behavior
    default, nonpayment, nonremittal
    act of failing to meet a financial obligation
    loss due to not showing up
    capitulation, fall, surrender
    the act of surrendering (usually under agreed conditions)
    habitual relapse into crime
    an out resulting from a fielding play (not a strikeout)
    an out resulting from the batter getting three strikes
    a lack of conformity with law or custom or practice etc.
    type of:
    nonaccomplishment, nonachievement
    an act that does not achieve its intended goal
  2. noun
    an event that does not accomplish its intended purpose
    “the surprise party was a complete failure
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    an event that accomplishes its intended purpose
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    downfall, ruin, ruination
    failure that results in a loss of position or reputation
    a complete or conspicuous failure
    a failure to function normally
    abortion, miscarriage
    failure of a plan
    misfire, miss
    a failure to hit (or meet or find etc)
    bust, fizzle, flop
    a complete failure
    malformation, miscreation
    something abnormal or anomalous
    breakdown, equipment failure
    a cessation of normal operation
    defeat, licking
    an unsuccessful ending to a struggle or contest
    an idea or plan that has no chance of being successful
    a sudden malfunction of a part or apparatus
    a malfunction in the flight of an aircraft in which there is a sudden loss of lift that results in a downward plunge
    the downfall of someone (as of persons on one side of a conflict)
    bomb, dud, turkey
    an event that fails badly or is totally ineffectual
    something hideous or frightful
    brake failure
    brakes fail to stop a vehicle
    engine failure
    engine does not run
    dud, misfire
    an explosion that fails to occur
    a temporary suspension of operation (as of computers)
    power failure, power outage
    equipment failure resulting when the supply of power fails
    (electronics) equipment failure attributable to some defect in a circuit (loose connection or insulation failure or short circuit etc.)
    a narrow defeat or a defeat at the last minute
    a decisive defeat in a game (especially in cribbage)
    an overwhelming defeat
    shutout, skunk
    a defeat in a game where one side fails to score
    debacle, drubbing, slaughter, thrashing, trouncing, walloping, whipping
    a sound defeat
    a final crushing defeat
    a defeat in which the losing person or team fails to score
    a failure to sustain social norms or expected conditions
    type of:
    happening, natural event, occurrence, occurrent
    an event that happens
  3. noun
    lack of success
    “he felt that his entire life had been a failure
    “that year there was a crop failure
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    a state of prosperity or fame
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    a state of complete lack of some abstract property
    bank failure
    the inability of a bank to meet its credit obligations
    crop failure
    the failure of crops to produce a marketable surplus
    dead duck
    something doomed to failure
    type of:
    circumstances, destiny, fate, fortune, lot, luck, portion
    your overall circumstances or condition in life (including everything that happens to you)
  4. noun
    a person with a record of failing; someone who loses consistently
    synonyms: loser, nonstarter, unsuccessful person
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    achiever, succeeder, success, winner
    a person with a record of successes
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    bankrupt, insolvent
    someone who has insufficient assets to cover their debts
    flash in the pan
    someone who enjoys transient success but then fails
    dud, flop, washout
    someone who is unsuccessful
    one at a disadvantage and expected to lose
    type of:
    unfortunate, unfortunate person
    a person who suffers misfortune
  5. noun
    an unexpected omission
    “he resented my failure to return his call”
    “the mechanic's failure to check the brakes”
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    dashing hopes, disappointment
    an act (or failure to act) that disappoints someone
    a failure to perform some promised act or obligation
    a failure to face some difficulty squarely
    breach of contract
    a breach of a legal duty; failure to do something that is required in a contract
    breach of duty
    a breach of due care
    type of:
    omission, skip
    a mistake resulting from neglect
  6. noun
    loss of ability to function normally
    “kidney failure
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    coronary failure, heart failure
    inability of the heart to pump enough blood to sustain normal bodily functions
    kidney failure, renal failure
    inability of the kidneys to excrete wastes and to help maintain the electrolyte balance
    congestive heart failure
    inability to pump enough blood to avoid congestion in the tissues
    heart attack
    a sudden severe instance of abnormal heart function
    acute kidney failure, acute renal failure
    renal failure associated with burns or other trauma or with acute infection or obstruction of the urinary tract
    chronic kidney failure, chronic renal failure
    renal failure that can result from a variety of systemic disorders
    type of:
    disorder, upset
    a physical condition in which there is a disturbance of normal functioning
  7. noun
    inability to discharge all your debts as they come due
    “fraudulent loans led to the failure of many banks”
    synonyms: bankruptcy
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    type of:
    the lack of financial resources
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