Definition of "chronically"

They have established themselves as the greatest story of Euro 2016 and it feels almost like a trick of the imagination that it is only four years since they were ranked 133rd in the world. That, however, will not lessen the embarrassment for England, their departing manager and a set of players who chronically under-performed after Wayne Rooney’s early penalty.

2016 June 27, Daniel Taylor, “England humiliated as Iceland knock them out of Euro 2016”, in The Guardian‎, London