The difference between Mainly and Thunderously
When used as adverbs, mainly means forcefully, vigorously, whereas thunderously means in a thunderous manner, very loudly.
check bellow for the other definitions of Mainly and Thunderously
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Mainly as an adverb (obsolete):
Forcefully, vigorously.
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Mainly as an adverb (obsolete):
Of the production of a sound: loudly, powerfully.
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Mainly as an adverb (obsolete):
To a great degree; very much.
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Mainly as an adverb:
Chiefly; for the most part.
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Thunderously as an adverb:
In a thunderous manner, very loudly.