Urdummheit
absurdity
absurdness
big deal
blank mind
blankmindedness
blankness
brainlessness
bull
bunk
calm of mind
craziness
devilishness
devilment
devilry
deviltry
dottiness
elfishness
emptiness
emptiness of mind
empty-headedness
extravagance
fallow mind
fatuity
flightiness
flimsiness
folly
frivolity
frivolousness
futility
giddiness
high spirits
idleness
ignorance
impishness
impracticality
imprudence
inanity
incapacity
indiscretion
ineptitude
injudiciousness
insanity
insensibility
irrationality
irresponsibility
error
fault
mistake
stupidity
fool
arrogance
blindness
brutality
carelessness
cowardice
deceit
disobedience
incompetence
infatuation
laziness
nonsense
obstinacy
rashness
recklessness
wisdom