deep
adjective
extending far down from the top or surface.
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Navier-Stokes is one of the seven deepest and most difficult unresolved questions known as the “Millennium Prize Problems”; since 2000, only one had ever been solved.
From The Wall Street Journal ● Sep. 8, 2026
Their deepest fear is that humans could eventually lose control of increasingly capable AI systems altogether.
From Los Angeles Times ● Sep. 6, 2026
"These microbes remind us that even the smallest partners can leave the deepest mark on our history."
From Science Daily ● Sep. 3, 2026
It is managed by the US Department of Energy's Sanford Underground Research Facility in South Dakota - the deepest laboratory in the US at nearly a mile beneath the ground.
From BBC ● Sep. 2, 2026
All the deepest and darkest and most tender parts of myself.
From "The Sea in Winter" by Christine Day
