perseverance in carrying out action:
inactivity,
lethargy,
laziness,
inattention,
carelessness,
negligence,
neglect,
ignorance,
indolence,
indifference,
thoughtlessness,
idleness,
disregard.
noun:
fickleness,
neglect,
slackness,
sloth,
changeableness,
negligence,
carelessness,
inconstancy,
inattention,
remissness.