From Longman Dictionary of Contemporary Englishgenerous/loyal/honest etc to a faultgenerous/loyal/honest etc to a faultVERYextremely generous, loyal etc Barry’s kind, caring and generous to a fault. → fault
Examples from the Corpus
generous/loyal/honest etc to a fault• Your tutor may be generous to a fault but can not reward irrelevance or peripheral knowledge display. 3.• His father's brother, Gloucester had hitherto been loyal to a fault.• He is loyal to a fault, even to his enemies.• David was loyal to a fault, and in his naive understanding quietly expected the same kind of loyalty in return. 