Lacking the power to produce a desired effect.
Roget 158:
powerless,
impotent,
unable,
incapable,
incompetent;
inefficient,
ineffective;
inept;
unfit,
unfitted;
unqualified,
disqualified;
unendowed;
inapt,
unapt;
crippled,
disabled
etc.
v.;
armless†.
harmless,
unarmed,
weaponless,
defenseless,
sine ictu [Lat.],
unfortified,
indefensible,
vincible,
pregnable,
untenable.
paralytic,
paralyzed;
palsied,
imbecile;
nerveless,
sinewless†,
marrowless†,
pithless†,
lustless†;
emasculate,
disjointed;
out of joint,
out of gear;
unnerved,
unhinged;
water-logged,
on one's beam ends,
rudderless;
laid on one's back;
done up,
dead beat,
exhausted,
shattered,
demoralized;
graveled
etc.
(in difficulty)
704;
helpless,
unfriended†,
fatherless;
without a leg to stand on,
hors de combat [Fr.],
laid on the shelf.
null and void,
nugatory,
inoperative,
good for nothing;
ineffectual
etc.
(failing)
732;
inadequate
etc.
640;
inefficacious
etc.
(useless)
645.
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Roget 645:
useless,
inutile,
inefficacious,
futile,
unavailing,
bootless;
inoperative
etc.
158;
inadequate
etc.
(insufficient)
640;
inservient†,
unsubservient;
inept,
inefficient
etc.
(impotent)
158;
of no avail
etc.
(use)
644;
ineffectual
etc.
(failure)
732;
incompetent
etc.
(unskillful)
699;
stale, flat and unprofitable;"
superfluous
etc.
(redundant)
641;
dispensable;
thrown away
etc.
(wasted)
638;
abortive
etc.
(immature)
674.
worthless,
valueless,
priceless;
unsalable;
not worth a straw
etc.
(trifling)
643,
dear at any price.
vain,
empty,
inane;
gainless†,
profitless,
fruitless;
unserviceable,
unprofitable;
ill-spent;
unproductive
etc.
169;
hors de combat [Fr.];
effete,
past work
etc.
(impaired)
659;
obsolete
etc.
(old)
124;
fit for the dust hole;
good for nothing;
of no earthly use;
not worth having,
not worth powder and shot;
leading to no end,
uncalled for;
unnecessary,
unneeded.
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