Yes she has. In the Goblet of Fire Professor Moody put the Imperius Curse on everyone in the class to see if they could fight it off. Harry was the only one who could.
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Harry Potter has used two unforgivable curses. In the Order of the Phoenix he used the Cruciatus curse on Bellatrix Lestrange, then in the Deathly Hallows he used the Imperius curse to break into Gringotts.
"Crucio" Cruciatus Curse - torture curse"Imperio" Imperius Curse - mind controlling curse"Avada Kedavra" Curse - killing curseThese three illegal spells are more infamously known as The Unforgivable Curses.
No,the books don't mention it. Atleast I don't think so. He would have gone to Azkaban Prison for MURDER though wouldn't he. Harry killed people. McGonagall used the Imperius Curse on Amycus Carrow though. I would recommend this question to be asked by a Harry Potter expert.
there is no such thing as a curse. Dur
Greed is a curse, so in this phrase, greed is the curse of wanting more than is needed. A curse of greed might lead to over reaching or overextending, which can be disastrous.