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