Noun which may take the genitive case particle 'no', Na-adjective (keiyodoshi), Noun
unfortunate; unhappy; ill-fated; hapless
どこからどう見ても薄幸の美少女、悲劇のヒロインだ。No matter how you look at it you're a beautiful, ill-fated woman, the heroine of a tragedy.
Also written 薄倖【はっこう】