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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.

OpenAI has done an in-depth study at just what AI disruption means for the jobs market, pushing back at some gloomier forecasts.

From The Wall Street Journal • Apr. 17, 2026

Lord Mandelson was announced as the UK's ambassador to the US in December 2024, before in-depth vetting had been carried out, and formally took up the role on 10 February 2025.

From BBC • Apr. 16, 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

“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.