A felony is an intentionally committed criminal offence for which the law prescribes a penalty more severe than two years' imprisonment. All other offences are misdemeanours.
One of the key words in this definition is 'intentional'. If I break into a Trabant and steal a car radio worth 60,000 forints, that is a felony. If I cause a road accident through negligence in which thirty people lose their lives, that is a misdemeanour.