conformity to a standard:
inaccuracy,
inexactness,
irregularity,
imprecision.
faithfulness in a relationship:
enmity,
unsteadiness,
faithlessness,
wavering,
disloyalty,
nonconformity,
infidelity,
lying,
vacillation,
treachery,
inconstancy.
fidelity:
inaccuracy,
unfaithfulness,
disloyalty,
treachery,
inconstancy,
infidelity.
noun:
disaffection,
estrangement,
separation,
alienation.