bad
incompetent
unadept
jackleg
untalentedness
skilless
unseen
inexpert
rude
inadequacy
skillessness
amateur
untalented
hopeless
talentlessly
clumsy
untalentedly
fumbling
bungling
unskillfulness
odd-job
unartful
inefficient
unversed
ineffective
unhackneyed
lackluster
unskilfulness
simple-mindedly
ungifted
weak
nonproficiency
unproficiency
improficiency
stultified
unchallenged
fledgling
ham-fisted
learningless
lightweight
facile
not the sharpest knife in the drawer
insufficient
not the sharpest tool in the shed
not the sharpest tool in the box
insufficiency
untempered
unerudite
incompetence
underskilled