in-depth

UK: /ˌɪnˈdɛpθ/ US: (in′depth′)

WordReference Random House Learner's Dictionary of American English © 2025

ˈin-ˈdepth,  adj. 

1. intensive;
   thorough:
   an in-depth study.

WordReference Random House Unabridged Dictionary of American English © 2025

in-depth  (in′depth′), adj. 

1. extensive, thorough, or profound:
   an in-depth analysis of the problem.
2. well-balanced or fully developed.

• 1960–65

Collins Concise English Dictionary © HarperCollins Publishers::

in-depth adjective

1. carefully worked out; detailed and thorough: an in-depth study