Definition of "imbalance"

Ross Barkley, a second-half substitute, almost marked his debut with a goal but by that stage England were playing at half-pace. A team can do that when the imbalance of talent is this considerable.

6 September 2013, Daniel Taylor, “Danny Welbeck leads England's rout of Moldova but hit by Ukraine ban”, in The Guardian‎

There are some stations which have literally 1,000-1,500 passengers a year, whereas Whitby has over 140,000, so there's a huge imbalance between the usage of some stations and others.

2020 January 2, Graeme Pickering, “Fuelling the changes on Teesside rails”, in Rail, page 60