It seems that in depth is like two separate words like

I have studied this subject in some depth.

But in-depth is like one word and an adjective

He has an in-depth knowledge of the subject .

Am I correct? Would you provide more information about their difference?

1 Answer 1


"In-depth" is an adjective which means comprehensive and precise, while "in depth" is a phrase or idiom which works like an adverb, meaning the same, so as comprehensively and precisely. Examples: An in-depth analysis of the problem. The problem was analysed in depth.

  • Can you say [he did x] more in depth, or would you have to say [he did x] in more depth?
    – Nearoo
    Commented Nov 21, 2018 at 10:30

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