3) I would choose:
carefree,easy-going, cheerful, sociable, stubborn, insecure, calm,outgoing,hardworking, intelligent, obstinate, bossy.´
My election is because these words are less complex than the rest.
4) some English false-friends:
actually= de hecho // actualmente= nowadays
sensitive=sensible // sensato=sensible
library= biblioteca // librería= bookshop
career= trayectoria profesional // carrera=degree