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Synonyms for in efficient
adj not working well; wasteful

sloppy
inept
weak
feeble
disorganized
ineffective
ineffectual
faulty

incompetent
careless
extravagant
half-baked
improvident
incapable
inefficacious
inexpert

prodigal
slack
slipshod
slovenly
unfit
unprepared
unqualified
unskilled

unskillful
untrained
improficient
not cut out for
shooting blanks
can’t hack it

Antonyms for in efficient

competent
dexterous
skillful
capable
efficient

expert
useful
neat
tidy
able

fit
strong
effective
sound

Synonyms
adj not strong; ineffective

fragile
paltry
inefficient
weakened
lame
frail
weak
flabby
tame
sickly
decrepit
infirm
ailing
incompetent

puny
aged
chicken
debilitated
delicate
doddering
dopey
effete
enervated
exhausted
failing
faint
flat
gentle

helpless
impotent
inadequate
indecisive
ineffectual
insubstantial
insufficient
languid
low
poor
powerless
slight
thin
unconvincing

woozy
zero
weakly
emasculated
enfeebled
etiolated
out of gas
sapless
strengthless
vitiated
wimpy

Antonyms

unbreakable
capable
competent
efficient
expert
healthy

hardy
powerful
firm
strong
able
fit

hearty
effective
solid
sound

Synonyms
adj incapable, incompetent; vulnerable

defenseless
weak
impotent
disabled
unprotected
unable
paralyzed
forlorn

destitute
powerless
abandoned
debilitated
dependent
exposed
feeble
forsaken

friendless
inefficient
inexpert
infirm
invalid
prostrate
shiftless
unfit

over a barrel
basket-case
handcuffed
pinned
tapped
tapped out
up creek without paddle
with hands tied

Antonyms

powerful
potent
capable
competent

enterprising
independent
resourceful
skilled

strong
able
fit
secure

Synonyms
adj unskillful, unable

inefficient
incapable
inadequate
inept
unskilled
ineffectual
useless
unqualified
helpless

amateurish
inexperienced
raw
amateur
awkward
bungling
bush-league
clumsy
ineligible

inexpert
insufficient
maladroit
unfit
uninitiated
untrained
disqualified
floundering
not cut out for

not equal to
not have it
out to lunch
unadapted
unequipped
unfitted
unhandy
unproficient

Antonyms

capable
competent
expert
useful
skilled

adept
dexterous
efficient
experienced
proficient

skillful
able
qualified
strong
effective

Synonyms
adj weak, useless

abortive
barren
bootless
feckless
feeble
fruitless
futile
idle
impotent
inadequate
incompetent

indecisive
inefficient
inept
inferior
innocuous
inoperative
lame
limited
nugatory
null
null and void

paltry
powerless
spineless
unable
unavailing
unfruitful
unproductive
unprofitable
unsuccessful
vain
void

withered
worthless
inefficacious
anticlimactic
defeasible
forceless
invertebrate
neutralized

Antonyms

competent
effectual
efficient

powerful
useful
effective

strong

Synonyms
adj clumsy, unskilled; incompetent

bumbling
incompetent
awkward
inefficient
artless
bungling

butterfingers
gauche
halting
incapable
inexpert
loser

maladroit
ungraceful
unskillful
wooden
unapt
all thumbs

inadept
undexterous
unfacile
unhandy
unproficient

Antonyms

capable
competent
dexterous
efficient
expert

skillful
adroit
skilled
acceptable
suitable

able
fit
proper

Synonyms
adj feeble, weak

flimsy
poor
thin
faulty

flabby
inadequate
ineffective
inefficient

insufficient
unconvincing
unsatisfactory
unsuitable

faltering
unpersuasive
unpleasing

Antonyms

agile
mobile
capable

efficient
satisfactory
strong

able
walking
uncrippled

Synonyms
adj not having talent, skill

weak
impotent
unfit
incapable
inadequate
helpless
powerless
clumsy

incapacitated
incompetent
ineffectual
inefficacious
inefficient
inept
inoperative
out of commission

unqualified
unskilled
sidelined
not able
hog-tied
impuissant
no can do
no good

not cut out for
not equal to
not up to
unfitted
can’t cut it
can’t hack it
can’t make the grade

Antonyms

potent
capable
sufficient
competent

adequate
skillful
talented
strong

able
fit
qualified

Synonyms
adj not ready

ineligible
incapable
inadequate
impotent
unable
useless
unqualified
unprepared
debilitated
incapacitated
bungling

amateur
awkward
bush league
clumsy
feeble
heavy-handed
incompetent
ineffective
inefficient
inept
inexperienced

inexpert
maladjusted
maladroit
unskilled
unskillful
untrained
weak
unapt
unpracticed
ill-equipped
unfitted

blundering
disqualified
butter-fingered
no good
not cut out for
not equal to
not up to
unhandy
unproficient

Antonyms

capable
competent
adequate
appropriate

suitable
willing
qualified
strong

able
fit
ready

Synonyms
adj not done well or skillfully

negligent
inefficient
improper
ignorant
lax

unethical
incompetent
amateur
amateurish
inadequate

inexperienced
inexpert
unsuitable
untrained
unworthy

nonexpert
unfitting

Antonyms

capable
competent
efficient
expert

moral
experienced
professional
skilled

able
right
good

Synonyms
adj useless

fruitless
indecisive
worthless
unable
unproductive
inefficient
limited
inadequate
inept
null
impotent
powerless

feeble
ineffectual
futile
unsuccessful
unprofitable
incompetent
abortive
barren
bootless
emasculate
feckless
idle

inferior
innocuous
inoperative
lame
nugatory
paltry
spineless
unavailable
unavailing
unfruitful
vain
void

withered
inefficacious
anticlimactic
defeasible
forceless
neutralized
no go
no way
not effective
slack-spined

Antonyms

fruitful
potent
productive
profitable
successful
useful
valuable
worthwhile

worthy
adequate
capable
competent
skillful
efficient
expert
sufficient

dexterous
effectual
powerful
able
fit
effective
strong

Synonyms
adj useless

unproductive
inefficient
inadequate
impotent

ineffective
futile
insufficient
hopeless

idle
unable
unavailing
vain

weak

Antonyms

capable
competent
adequate

enough
sufficient
productive

effectual
able
effective

Synonyms
adj ineffectual

abortive
barren
bootless
feckless
feeble
fruitless
futile
idle
impotent
inadequate
incompetent

indecisive
ineffective
inefficient
inept
inferior
innocuous
inoperative
lame
limited
nugatory
null

null and void
paltry
powerless
spineless
unable
unavailing
unfruitful
unproductive
unprofitable
unsuccessful
useless

vain
void
withered
worthless
anticlimactic
defeasible
forceless
invertebrate
neutralized