Kamma is often translated as action.
It has a different meaning outside which finds its way in but the Pāḷi word translates as action. And action is intentional, it is not a mere motion "Penetrative (AN 6.63)":
'Cetanāhaṃ, bhikkhave, kammaṃ vadāmi. Cetayitvā kammaṃ karoti kāyena vācāya manasā.'
'Herewith the intention, almsmen, the action I say. Intending the action, one does by body, by speech, by intellect'.
We can only do something just now and of course, what we do leads to result; we do something precisely because of an expected result. That the exact 'result', the ripening of an action, is not found out is one thing, "Not what would be considered (AN 4.77)", but that there is ripening that is to be understood. Action is not a matter of believing.
Do yourself a favour and don’t use kamma but use action instead so that a misunderstanding is more easily spotted by and for yourself.
Pāḷi-English
Kamma (nt.) action.