The difference between At heart and Substantially
At heart is also phrase with the meaning: in spirit.
Substantially is also adverb with the meaning: in a strong substantial manner.
check bellow for the other definitions of At heart and Substantially
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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.