An impurity is something that ruins the uncontaminated nature of something. If someone accuses you of impurity, they think you or your nature has been spoiled in some way by sin.

When water is pure, the only thing in that water is water. Add a contaminant, say salt or bleach, and you are introducing an impurity, something that turns the water impure. When used with people, the word has a religious overtone. Someone who is pure is unspoiled by sin. Think Snow White. If you convinced Snow White to rob a bank with you, you'd be spoiling her good nature with your wretched impurity.

Definitions of impurity
  1. noun
    the condition of being impure
    synonyms: impureness
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    pureness, purity
    being undiluted or unmixed with extraneous material
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    adulteration, debasement
    being mixed with extraneous material; the product of adulterating
    admixture, alloy
    the state of impairing the quality or reducing the value of something
    contamination, taint
    the state of being contaminated
    the state of containing dirty impurities
    the state of being putrid
    undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities
    dust contamination
    state of being contaminated with dust
    biodegradable pollution
    pollution that is rendered harmless by natural processes and so causes no permanent harm
    nonbiodegradable pollution
    pollution that accumulates in the environment and may appear in the food chain
    air pollution
    pollution of the atmosphere
    noise pollution, sound pollution
    annoying and potentially harmful environmental noise
    thermal pollution
    harm to lakes and rivers resulting from the release of excessive waste heat into them
    water pollution
    pollution of the water in rivers and lakes
    type of:
    condition, status
    a state at a particular time
  2. noun
    worthless or dangerous material that should be removed
    “there were impurities in the water”
    synonyms: dross
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    type of:
    waste, waste material, waste matter, waste product
    any materials unused and rejected as worthless or unwanted
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