tried

tried
pt, pp of try1. tried, adj [attrib 作定语]
that has been proved to be effective, reliable, etc 经证明有效、 可靠等的
    a tried (and tested) remedy 经（试验）证明有效的疗法
    a tried and true friend 经过考验的真正的朋友.

牛津英汉双解词典