alertness, carefulness:
disregard,
thoughtlessness,
imprudence,
neglect,
heedlessness,
carelessness,
indiscretion,
negligence,
ignorance.
noun:
inattention,
inconsiderateness,
abruptness,
inconsideration,
oversight,
indifference,
omission,
impetuousness,
unwariness,
disregard,
precipitousness,
brashness,
suddenness,
remissness,
slight,
all clear,
thoughtlessness.