Oppressively constant (10)

I believe the answer is:

relentless

'oppressively constant' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for relentless that I've seen before include "Persistent" , "Uncompromising" , "Harsh, inflexible" , "Oppressively constant; inflexible" , "Allowing no respite" .)

I've seen this clue in The Mirror.

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