Deep; shallow (3)

I believe the answer is:

low

I believe this clue is a double definition.

'deep' is the first definition.
(similar in meaning)

'shallow' is the second definition.
(thesaurus)

(Other definitions for low that I've seen before include "Not elevated, may be base" , "Dejected; moo" , "Inferior; moo" , "Opposite of high" , "Not high or loud" .)

I've seen this clue in The Telegraph.

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