in-depth

in-depth (comparative more in-depth, superlative most in-depth)

1. Thorough; comprehensive.

   We are showing in-depth coverage of the World Championships.

   • 2021 February 24, “Rail industry marks National Apprenticeship Week”, in RAIL, number 925, page 17:

     Recruits will be taught in-depth electrical and mechanical engineering as well as gaining practical experience in rail maintenance.

• surface-level