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Synonyms

in-depth

American  
[in-depth] / ˈɪnˈdɛpθ /

adjective

  1. extensive, thorough, or profound.

    an in-depth analysis of the problem.

  2. well-balanced or fully developed.

in-depth British  

adjective

  1. carefully worked out, detailed and thorough

    an in-depth study
"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
in depth Idioms  

  1. Profoundly, thoroughly, as in It will take years to cover the entire subject in depth. [Mid-1900s]

Etymology

Origin of in-depth

First recorded in 1960–65

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.

Lord Mandelson was announced as the UK's ambassador to the US in December 2024, before in-depth vetting had been carried out.

From BBC • Apr. 17, 2026

The IMF hasn’t yet done in-depth research on how a permanent Iranian toll on ships passing through the Strait would affect energy prices, he added.

From Barron's • Apr. 14, 2026

Over the next three years, researchers will carry out an in-depth investigation of what is considered one of the most important recent finds from Roman Germania.

From Science Daily • Apr. 5, 2026

Ken Burns, with co-directors Sarah Botstein and David Schmidt, gives us an in-depth look at the war for independence that also happened to be a civil war.

From Los Angeles Times • Mar. 30, 2026

“Because I don’t want to! Do I have provide you with an in-depth analysis of every decision I make?”

From "Looking for Alaska" by John Green

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.