The difference between But good and Thoroughly
When used as adverbs, but good means to a high degree, whereas thoroughly means in a thorough or complete manner.
check bellow for the other definitions of But good and Thoroughly
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But good as an adverb (idiomatic):
To a high degree; very thoroughly; in a most definite manner.
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Thoroughly as an adverb:
In a thorough or complete manner.
Examples:
"He went out in the rain and came back thoroughly drenched."