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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