well founded
adjective uk/ˌwel ˈfaʊn.dɪd/ us/ˌwel ˈfaʊn.dɪd/
有事实根据的；理由充分的
based on facts
[ before noun ] He had to show that he had a well-founded fear of persecution on religious or political grounds to qualify as a refugee. 他必须证明自己有充分理由担心受到宗教或政治迫害，只有这样才能取得难民资格。