rusty
out of practice
unskillfulness
unskill
weak
insufficiency
dyscompetence
inadequacy
inability
bungling
fumbling
clumsy
ham-fisted
skillessness
incompetent
ineffective
nonmastery
unartful
incompetence
exceptional
mutton-fisted
unskilfulness
indocible
another string to one's bow
stupid
underskilled
doplic
omission
subexpert
skip
dysphasia
clumsiness
inefficiency
acognitive
inefficient
unintelligent
unability
lose one's touch
inexpertness
inexpert
unskilled
amateur
amateurish
remedial
skill
neglection
doppich
inept
the cobbler always wears the worst shoes
not the sharpest knife in the drawer
prowess
retardation
ineptness
subnormality
backwardness
awkwardness
slowness
mental retardation
ineptitude
maladroitness
expertness
not the sharpest tool in the box
not the sharpest tool in the shed
dumb
monosynaptic
dense
proficiency
dim
neglectedness
obtuse
deficit
slow
feckless
dull
outskilled
denseness
gormless
dumbness
slow-wittedness
lackluster
underbrained
neglected
impotent
adroitness
dysadaptation
ragged
semiskilled
learning disability