deep down (inside)

idiom

—used to mean that something is true or real even if it is not said or shown to other people

He knew deep down inside that she was right.

Deep down, I think we all felt the same way.

He might look like a mean old man, but deep down inside he is a very kind person.

Examples of deep down (inside) in a Sentence

Recent Examples on the Web

After high school, Higuchi ended up working in public service, with Japan’s post services, but knew deep down that his calling was in the creative world. —Sara Merican, Deadline, 22 Apr. 2025

Researchers have made a remarkable discovery deep down in the waters of the Atlantic Ocean off the coast of the South Sandwich Islands. —Ashley J. Dimella Fox News, FOXNews.com, 22 Apr. 2025

Living in Newport Beach, Calif., Laura knew deep down that someday this voicemail would become a sacred treasure. —Jordan Greene, People.com, 31 Mar. 2025

San Francisco Giants catcher Patrick Bailey hit a fly ball deep down the right field line in the bottom of the ninth inning on Monday's game. —Chantz Martin, FOXNews.com, 9 Apr. 2025