noun: A source of trouble, especially problems of technical nature.
homily noun: A lecture of a moralizing or admonishing nature, usually tedious and trite.
Klondike noun: A rich source of something valuable.
horse’s mouth noun: The original or authentic source of some information.
obduracy Definition: (noun) Resoluteness by virtue of being unyielding and inflexible. Synonyms: adamance, unyieldingness. Usage: My obduracy and hardheadedness often gets me in trouble at the negotiating table. Discuss