I think the way she was treated is a downright disgrace.我認爲那樣對待她是非常不光彩的。
She's being downright unhelpful and obstructive.她這個人很難相處,而且總喜歡與人作對。
The working conditions are unhealthy, if not downright (= and probably extremely) dangerous.這種工作環境即使稱不上非常危險,也是對身體有害的。