The difference between Efficacious and Fruitless
When used as adjectives, efficacious means effective, whereas fruitless means bearing no fruit.
check bellow for the other definitions of Efficacious and Fruitless
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Efficacious as an adjective (formal):
Effective; possessing efficacy.
Examples:
"this medicine is efficacious'"
"synonyms: effective"
"ant inefficacious"
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Fruitless as an adjective:
Bearing no fruit; barren.
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Fruitless as an adjective (figuratively):
Unproductive, useless.
Examples:
"The unskilled man’s attempt at fixing his car engine was fruitless."
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Fruitless as an adjective (figuratively, archaic):
Of a person: unable to have children; barren, infertile.
Examples:
"The fruitless woman desperately wanted to have children."
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Fruitless as an adjective (rare):
Of a diet, etc.: without fruit.