Origin: Latin suffix -al
Ineffectual has 4 different meanings across 1 category:
not producing an intended effect
"an ineffective teacher"
"ineffective legislation"
producing no result or effect
"a futile effort"
"the therapy was ineffectual"
"an otiose undertaking"
"an unavailing attempt"
lacking in power or forcefulness
"an ineffectual ruler"
"like an unable phoenix in hot ashes"
Unable or insufficient to produce effect.