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ineffectual
adj
1.
not producing an intended effect
unspeedful
unworksome
ineffective
uneffective
Derived from:
ineffectuality
ineffectualness
2.
producing no result or effect
futile
meaningless
otiose
unavailing
Derived from:
ineffectuality
ineffectualness
3.
lacking in power or forcefulness
ineffective
unable
Derived from:
ineffectuality
ineffectualness