ad lib
disability
disablement
disqualification
extemporaneousness
imbecility
improvisation
inability
inadeptness
inadequacy
inaptitude
inaptness
inattentiveness
incapacitation
incapacity
incompetence
incompetency
indexterity
ineffectiveness
ineffectuality
inefficiency
ineptitude
ineptness
infancy
inferiority
insufficiency
lack of preparation
legal incapacity
maladjustment
maladroitness
mediocrity
minority
nonpreparation
nonpreparedness
pedestrianism
planlessness
rustiness
skill-lessness
thoughtlessness
unaptness
uncleverness
undeftness
undexterousness
undextrousness
unfitness
unfittedness
unintelligence
unpreparedness
unproficiency
bizkit
cronyism
detective-inspector
divisiveness
doublespeak
expensiveness
feeble-mindedness
garlick
immoderation
improbity
inappropriateness
lightlessness
mucro
politicization
scalene
shoddiness
squalidness
traveling-bag
uncleanliness
unfaithfulness
unsuitableness
untrustworthiness