I think the way she was treated is a downright disgrace.我认为那样对待她是非常不光彩的。
She's being downright unhelpful and obstructive.她这个人很难相处,而且总喜欢与人作对。
The working conditions are unhealthy, if not downright (= and probably extremely) dangerous.这种工作环境即使称不上非常危险,也是对身体有害的。