incapaz
adjective
1
ser incapaz: no es que sea incapaz, es que no tengo fuerzas it's not that I can't do it, I just haven't got the strength; no sé cómo puedes engañarlo, yo sería incapaz I don't know how you can deceive him, I could never do a thing like that
ser incapaz de hacer algo (no atreverse, no querer) to never do sth; be incapable of doing sth (formal); (no poder) to be unable to do sth
¿es que eres incapaz de hablar en serio? can't you ever talk seriously?; aren't you capable of talking seriously? (formal)
la policía se mostró incapaz de prevenir la tragedia the police proved unable to prevent the tragedy
ser incapaz para algo to be useless at sth
soy incapaz para la física I'm useless at physics
incompetent; incompetent fool