lose one's touch
out of practice
outskilled
lose it
derank
unskill
upset
disconcert
untune
discomfit
discompose
apraxia
rusty
skillessness
nonmastery
fumbling
clumsy
bungling
incompetent
amateur hour
unskilled
ham-fisted
inexpertness
jobber
jabroni
inability
inadequacy
skill
fall
the cobbler always wears the worst shoes
nativism
remedial
technique
knowledge
another string to one's bow
unskilfulness
subexpert
low-skilled
unartful
dysphasia
not yet
untalentedness
spaz out
subnormal
disanimation
poorly
nonmechanical
unmechanical
drift off
illiterate
unskillfulness
ignorant
fall apart
rude
petit maître
go to pieces
god mode
ability
hopeless
hard skill
nonlearner
dequalification
microskill
take one's eye off the ball
fall from grace
skilless
undiplomatic
degenerate
spazz out
nontalent
it's not what you know but who you know
dedifferentiate
underplacement
learning disorder
nonproficiency
destream
exceptional
degeminate
improficiency
perdendo
skilllessness
unproficiency
learning disability
repertoire
paralysis
vocational
layman
attriter
prowess
misplace
proficient
unaccomplished
unably
numskull