brainish
careless
hotheaded
impetuous
impulsive
madcap
tearaway
asleep
brash
brazen
brazenfaced
goofing off
heedless
hubristic
impolitic
improvident
imprudent
impudent
inconsiderate
indiscreet
injudicious
insolent
napping
nodding
off-guard
overbold
overcareless
overconfident
oversure
overweening
rash
sleeping
temerarious
thoughtless
unalert
uncautious
unchary
unguarded
unprepared
unready
unvigilant
unwary
unwatchful
disrespectful
enigmatical
foolhardy
hasty
ill-considered
ill-judged
inattentive
iron-shod
neglectful
tentative
unbecoming
uncomplimentary
unfilial
unmannerly
unmindful
unperceptive
unprofessional
unscientific
unseemly
unskilful