reputedly       
adverb uk/rɪˈpjuː.tɪd.li/ us/rɪˈpjuː.t̬ɪd.li/
 据说
in a way that is said to be true, although it is not known to be certain
  She reputedly turned down a $2 million advertising contract. 据说她拒绝了价值200万美元的广告合同。 
 The leaves reputedly are good food for pigs.
 See: reputed
 - More examples
 - The organization was reputedly responsible for the attacks.
 - This is reputedly his favourite photo of himself.
 - The drug reputedly destroys fat cells.