chief

Negligence was the chief cause of the disaster.

'You’re doing it because she was your friend, not because she was a parishioner, and certainly not because of the Declaratory Articles,' Macmurray said, pushing himself forward on his seat. 'Everybody knows how chief you and she were. It was an unfitting relationship for a minister while she was alive, and it is equally unfitting for you to do her a favour like this now she's dead.'