The difference between Deep down and Substantially
When used as adverbs, deep down means fundamentally, whereas substantially means in a strong substantial manner.
check bellow for the other definitions of Deep down and Substantially
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Deep down as an adverb (idiomatic):
Fundamentally; in essence; in reality
Examples:
"He seems like an average businessman, but deep down he's an overgrown kid with a necktie."
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Substantially as an adverb:
In a strong substantial manner; considerably.
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Substantially as an adverb:
To a great extent; in essence; essentially.
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Substantially as an adverb:
Without material qualifications.