Is it grammatically correct to say that you wish to "study X at depth" (where X is some subject/field).

I thought you could say "study X at depth" similar to how you could say "study X in depth", but I'm not so sure anymore

  • 5
    If you used at depth, I would initially infer that it was an underwater study.
    – Davo
    Sep 25, 2019 at 19:55
  • I do occasionally see "at depth", but I think it mostly occurs in a phrase similar to "When X is examined at depth ..."
    – Hot Licks
    Sep 26, 2019 at 1:46
  • @HotLicks if you can say "when X is examined at depth..." why can you not say "I want to study(/examine) X at depth" ?
    – Pixelchai
    Sep 26, 2019 at 20:08
  • @PixelZerg - You can, it's just not as idiomatic.
    – Hot Licks
    Sep 26, 2019 at 21:39

2 Answers 2


I think you might have (con)fused "in depth" and "at length" with one another.

The Cambridge Dictionary define in-depth as:

done carefully and in great detail

For example:

You might have studied American modernism in-depth.

The idiom at length is defined by The Free Dictionary as:

in great detail

For example:

I studied American modernism in college, so I can speak about it at length.

  • What a reasonable answer.
    – Lambie
    Sep 26, 2019 at 19:57

You definitely study something "in depth". I wonder if you are thinking of the expression "at length"? "I studied the author in depth and then we discussed him at length".

  • This is the beginning of a valid answer. Perhaps you can flesh it out with some sourcing and examples of usage.
    – David M
    Sep 25, 2019 at 20:49

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