balky 
/ˈbɑ:ki/ adjective
balk·i·er; balk·i·est /ˈbɑ:ki/ adjective [also more balky; most balky] chiefly US : not doing what is wanted or expected
▪ Several balky [=stubborn] congressmen have refused to support the President's tax plan. ▪ a balky horse ▪ a balky engine
▪ Several balky [=stubborn] congressmen have refused to support the President's tax plan. ▪ a balky horse ▪ a balky engine
