sudden; abrupt; unexpected
in an instant; in a moment; immediately; suddenly; all of a sudden; all at once
one hundred-thousandth; sudden; abrupt; unexpected
careless; thoughtless; rash; rude; at fault
careless person; thoughtless person
indiscreet; thoughtless; absurd; laughable; disdaining; belittling
negligent; careless; (arch.) easygoing; (arch.) relaxed
to be negligent; to neglect; to slight
suddenly; abruptly; unexpectedly
cannot be treated lightly; requiring careful attention; cannot be ignored