1) Someone who isn't longer alive
2) A part of body that can not be felt
3) Urban Dictionary
4) A synonym for 'completely'
1) "Münir Ãzkul is dead since 2018.5.1"
2) "I've been sitting with my legs crossed for so long, my right leg has gone dead."(from Cambridge Dictionary)
3) "Urban Dictionary was killed by idiots a few years ago"
4) "You're dead right!