shooting blanks (adjective) inefficient: not working well; wasteful
Sinonime: can't hack it,
careless,
disorganized,
extravagant,
faulty,
feeble, half-baked, improficient, improvident,
incapable,
incompetent,
ineffective,
ineffectual, inefficacious,
inept, inexpert, not cut out for,
prodigal, shooting blanks,
slack, slipshod,
sloppy, slovenly, unfit, unprepared, unqualified, unskilled, unskillful, untrained,
weakAntonime: able,
capable,
competent,
efficient,
expert,
useful