Profound

Profound pro·​found /prəˈfound/ Adjective

1. intense, powerful

“People’s beliefs about their abilities have a profound effect on those abilities.”

– Albert Bandura (1925 – 2021)

2. intellectually deep

“The opposite of a fact is falsehood, but the opposite of one profound truth may very well be another profound truth.”

– Niels Bohr (1885 – 1962)