The difference between Excessive and Insufficient
When used as adjectives, excessive means exceeding the usual bounds of something, whereas insufficient means not sufficient.
check bellow for the other definitions of Excessive and Insufficient
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Excessive as an adjective:
Exceeding the usual bounds of something; extravagant; immoderate.
Examples:
"Putting a wide vibrato on a single 16th triplet note at 160 beats per minute seems rather excessive."
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Insufficient as an adjective:
Not sufficient.