The difference between Gradual and Insidious
When used as adjectives, gradual means proceeding or advancing by small, slow, regular steps or degrees, whereas insidious means producing harm in a stealthy, often gradual, manner.
Gradual is also noun with the meaning: an antiphon or responsory after the epistle, in the mass, which was sung on the steps, or while the deacon ascended the steps.
check bellow for the other definitions of Gradual and Insidious
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Gradual as an adjective:
Proceeding or advancing by small, slow, regular steps or degrees
Examples:
"a gradual increase of knowledge; a gradual decline"
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Gradual as a noun (Christianity):
An antiphon or responsory after the epistle, in the Mass, which was sung on the steps, or while the deacon ascended the steps.
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Gradual as a noun (Christianity):
A service book containing the musical portions of the Mass.
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Insidious as an adjective:
Producing harm in a stealthy, often gradual, manner.
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Insidious as an adjective:
Intending to entrap; alluring but harmful.
Examples:
"Hansel and Gretel were lured by the witch’s insidious gingerbread house."
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Insidious as an adjective (nonstandard):
Treacherous.
Examples:
"The battle was lost due to the actions of insidious defectors."