@JeremyECrawford does a magic weapon still bypass resistance or immunity to nonmagical attacks if it requires attunement and the wielder isn't attuned?

— Armando Doval (@armando_doval) November 12, 2018

You can strike someone with a magic weapon even if you're not attuned to it, and the weapon still counts as magical. Your attunement doesn't determine its magicalness. #DnD https://t.co/CaUuaC2G3x

— Jeremy Crawford (@JeremyECrawford) November 12, 2018

But by not attuning, it behaves as a magic version of the standard weapon? i.e. if part of its attunement was an increase to attack and damage, that wouldn’t be part of the attack?

— Rob 🎲 🍷 🏳️‍🌈 (@DiceRefgemlin) November 12, 2018

If you're not attuned to a magic item that requires attunement, you benefit from none of its properties. But it is still an object (a sword, a suit of armor, a book, etc.) and functions as such. And it is magical.

See the DMG for more on attunement. #DnD https://t.co/1DU9qRfNdn

— Jeremy Crawford (@JeremyECrawford) November 12, 2018