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