Is there a way of deciding whether the syllable of a word, in RP, can never be stressed in any sentence?
E.g. congenital /kənˈdʒɛnɪt(ə)l/
I would assume that '(ə)l' can never be stressed, whatever it appears in. If only because I then say it 'ʊl'.
NOTE: my question only makes sense assuming that stress in English is not limited to the word stress defined in dictionaries.