apocryphal
adjective formal uk/əˈpɒk.rɪ.fəl/ us/əˈpɑː.krə.fəl/
（一些广为流传的故事）可疑的，不足为信的，杜撰的
An apocryphal story is probably not true although it is often told and believed by some people to have happened.
an apocryphal story 杜撰的故事
It's a good story but I dare say it's apocryphal. 故事不错，但很可能是杜撰的。