Etymology
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ineffectual (adj.)

early 15c., from in- (1) "not, opposite of" + effectual. Related: Ineffectually; ineffectuality.

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Definitions of ineffectual

ineffectual (adj.)
not producing an intended effect;
Synonyms: ineffective / uneffective
ineffectual (adj.)
producing no result or effect;
the therapy was ineffectual
ineffectual (adj.)
lacking in power or forcefulness;
an ineffectual ruler
Synonyms: ineffective / unable
From wordnet.princeton.edu