abortive:
consummated,
productive,
complete,
successful,
fruitful.
all:
effective.
feckless:
purposeful,
responsible.
fruitless:
plentiful,
copious,
profitable,
potent.
futile:
hopeful.
impotent:
capable,
able,
fertile.
incapable:
qualified.
ineffective:
effective.
ineffective/ineffectual:
effectual,
powerful,
efficient,
strong,
useful,
competent.
inefficient:
expert.
lame:
satisfactory.
noun:
expedient,
virtuous,
worthwhile,
practicable,
meaningful,
feasible,
successful,
usable,
workable,
beneficial,
sufficient,
applicable,
realizable,
stiff,
practical,
operant,
profitable,
adequate,
deadly,
useful.
n.:
toothed,
virile.
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