If someone is unfit, they're not qualified. You're unfit for a job as an ice cream truck driver if your only driving experience has been steering a bumper car at an amusement park.

Farmland can be described as unfit for planting if it's been leached of nutrients, and a babysitter might be accused of being unfit if he gets distracted and loses track of his charges on the playground. In either case, the unfit thing or person doesn't meet the necessary requirements or standards. Another way to be unfit is to be out of shape or in poor physical condition. Fit can mean both "suitable" and "in good shape."

Definitions of unfit
  1. adjective
    below the required standards for a purpose
    “an unfit parent”
    unfit for human consumption”
    unfit for human beings
    not meant or adapted for a particular purpose
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    meeting adequate standards for a purpose
    suitable for a particular person, place, condition, etc.
    adequate for the purpose
    suitable, suited
    meant or adapted for an occasion or use
    having qualities or abilities that merit recognition in some way
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  2. adjective
    not in good physical or mental condition; out of condition
    “fat and very unfit
    “certified as unfit for army service”
    afflicted, impaired
    mentally or physically unfit
    apractic, apraxic
    having uncoordinated muscular movements, symptomatic of a CNS disorder
    bandy, bandy-legged, bowed, bowleg, bowlegged
    have legs that curve outward at the knees
    (of a horse) having bones of the back united by a bony growth
    crippled, game, gimpy, halt, halting, lame
    disabled in the feet or legs
    crookback, crookbacked, gibbous, humpbacked, humped, hunchbacked, kyphotic
    characteristic of or suffering from kyphosis, an abnormality of the vertebral column
    disabled, handicapped
    incapable of functioning as a consequence of injury or illness
    (British informal) sore or lame
    having the knees abnormally close together and the ankles wide apart
    flabby, flaccid, soft
    out of condition; not strong or robust; incapable of exertion or endurance
    (of horses) afflicted with a swelling of the hock-joint
    dipped, lordotic, swayback, swaybacked
    having abnormal sagging of the spine (especially in horses)
    maimed, mutilated
    having a part of the body crippled or disabled
    not in or exhibiting good health in body or mind
    not sound financially
    ill, sick
    affected by an impairment of normal physical or mental function
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    physically and mentally sound or healthy
    able, able-bodied
    having a strong healthy body
    conditioned, in condition
    physically fit
    having or indicating good health in body or mind; free from infirmity or disease
    financially secure and safe
    in good health especially after having suffered illness or injury
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  3. adjective
    physically unsound or diseased
    synonyms: bad, unsound
    not in or exhibiting good health in body or mind
  4. verb
    make unfit or unsuitable
    synonyms: disqualify, indispose
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    dispose, qualify
    make fit or prepared
    type of:
    alter, change, modify
    cause to change; make different; cause a transformation
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