Stupid to follow up oath (6)

I believe the answer is:

goddam

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'stupid' is the definition.
Both the answer and definition are adjectives. Maybe you can see an association between them that I don't see?

'follow up oath' is the wordplay.
'follow' becomes 'dog' (dog can mean to follow or torment).
'up' says the letters should be written backwards (in down clue: letters go upwards).
'oath' becomes 'dam' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'dog' back-to-front is 'god'.
'god'+'dam'='GODDAM'

'to' acts as a link.

Can you help me to learn more?

(Another definition for goddam that I've seen is " Blooming".)

I've seen this clue in The Guardian.

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