Are wizards able to cast different spells or repeated spells without saying the spell incantation and just by thought and wand movement. For example when Mrs. Weasly defeated Bellatrix.
1 Answer
Every wizard can do it, it's just a matter of experience. I guess difficult spells are more difficult to cast without an incantation and it can be said that is safer to cast it out loud. You literally "spell" it. :)
You can find many examples of no-incantation cast spells in those two previous questions: Why does Harry always cast spells out loud? and Why were there so many spells cast in the movies without saying the words to the spell?