Meaning of “profound” - Learner’s Dictionary

profound

adjective uk us /prəˈfaʊnd/
EFFECT

If an effect is profound, it is extreme:

The war had a profound impact on people's lives.
FEELING

If a feeling is profound, you feel it very strongly:

a profound sense of sadness
UNDERSTANDING

If an idea or piece of work is profound, it shows intelligence or a great ability to understand:

a profound question
His theories were simple, but profound.
profoundly adverb

(Definition of “profound” from the Cambridge Learner’s Dictionary © Cambridge University Press)