Vastly vs. Fastly

Vastly vs. Fastly — Is There a Difference?
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Difference Between Vastly and Fastly

Vastlyadverb

Greatly, in a vast manner.

Fastlyadverb

securely; fast

We tied the rope fastly this time; we didn't want it to get away again.

Vastlyadverb

to an exceedingly great extent or degree;

He had vastly overestimated his resourceswas immensely more important to the project as a scientist than as an administrator

Fastlyadverb

(nonstandard) quickly

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