/ prəˈfaʊnd; NAmE / adjective
1.
very great; felt or experienced very strongly :
profound changes in the earth's climate
My father's death had a profound effect on us all.
2.
showing great knowledge or understanding :
profound insights
a profound book
3.
needing a lot of study or thought :
profound questions about life and death
4.
( medical ) very serious; complete :
profound disability
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WORD ORIGIN
Middle English : from Old French profund , from Latin profundus deep, from Latin pro before + fundus bottom. The word was used earliest in the sense showing deep insight .