What does deepest mean?
"Deepest" is the superlative form of the adjective "deep," indicating the greatest extent downward or inward, whether in physical space, emotion, or abstract degree. Literally, it describes what reaches farthest below a surface, as in the deepest point of a lake or the deepest layer of sediment. Figuratively, it conveys maximum intensity or profundity: one's deepest fears, deepest convictions, or deepest sympathy all express the strongest possible degree of feeling. The word also appears in set phrases like "in your deepest sleep" and "my deepest apologies," where it lends gravity and sincerity. Because it implies comparison against all alternatives, it usually appears with the definite article. Derived from the Old English "dēop" through regular superlative formation, "deepest" remains a versatile, everyday word equally at home in scientific description, emotional expression, and formal courtesy.
Superlative of "deep": extending furthest down, in, or through; or greatest in intensity, profundity, or degree.
"The miners worked at the deepest level of the shaft."
Usually preceded by "the" in literal uses; often appears in fixed polite expressions like "deepest condolences."
Superlative of the adverb "deep": to the greatest depth or extent.
"Of all the roots, this one penetrates deepest into the soil."
"Deepest" isn't just for oceans — English speakers reach for it when words fail, offering their deepest apologies and probing their deepest fears.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of deepest
"Deepest" derives from Old English "dēop," meaning profound or extending far down, which shares a Germanic root with Dutch "diep" and German "tief." The superlative suffix "/-est/" is a native Germanic ending, so "deepest" was formed by ordinary English inflection rather than borrowing. Related English words such as "depth" and "dip" trace back to the same Germanic base, reflecting a long-standing family of terms for downward extent.
Related word forms
How deepest is actually used
"Deepest" is neutral register and appears in both literal and figurative contexts. In fixed expressions such as "deepest condolences" or "deepest sympathies," it carries a formal, sincere tone common in condolence messages. As a predicative adjective it typically takes "the": "the deepest part." It can also function adverbially as the superlative of the adverb "deep" ("dig deepest").
Easily confused with deepest
"Deeper" is the comparative form used to compare two things, while "deepest" is the superlative used when one thing exceeds all others.