Of sound mind (4)

I think it could be either:

sane

lung

'of sound mind' is the definition.
(similar in meaning)

This is all the clue.

(Other definitions for sane that I've seen before include "Compos mentis" , "In full possession of mental faculties" , "Sound in mind" , "Mentally healthy" , "Identical" .)

I've seen this clue in the LA Times, The New York Times, The Times, the Newsday, The Star Tribune, the Evening Standard, The Independent and The Mirror.

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