The difference between Ineffectual and Vain
When used as adjectives, ineffectual means unable or insufficient to produce effect, whereas vain means overly proud of oneself, especially concerning appearance.
check bellow for the other definitions of Ineffectual and Vain
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Ineffectual as an adjective:
unable or insufficient to produce effect; futile
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Ineffectual as an adjective:
worthless
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Ineffectual as an adjective:
weak, indecisive; lacking forcefulness
Examples:
"Our group leader proved highly ineffectual, caving to every whim put forth by the other members."
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Vain as an adjective:
Overly proud of oneself, especially concerning appearance; having a high opinion of one's own accomplishments with slight reason.
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Vain as an adjective:
Having no real substance, value, or importance; empty; void; worthless; unsatisfying.
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Vain as an adjective:
Effecting no purpose; pointless, futile.
Examples:
"'vain toil;  a vain attempt"
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Vain as an adjective:
Showy; ostentatious.