Definition from Wiktionary, the free dictionary
From Old French faulcon hagard (“wild falcon”) ( > French hagard (“dazed”)), from Middle High German hag (“coppice”)  ( > archaic German Hag (“hedge, grove”)). Akin to Frankish hagia ( > French haie (“hedge”))
looking exhausted and unwell
wild or untamed
haggard (plural haggards)
- (dialect, Manx, Ireland) A stackyard, an enclosure on a farm for stacking grain, hay, etc.
- "He tuk a slew [swerve] round the haggard" 
- (falconry) A hunting bird captured as an adult.
- A "haggard" is a bird captured as an adult and therefore of unknown age; often, the law prohibits capturing birds of mating age. Falconry Pro
- (falconry) A young or untrained hawk or falcon.
- (obsolete) A fierce, intractable creature.
- I have loved this proud disdainful haggard.
- (obsolete) A hag.
- (Can we find and add a quotation of Garth to this entry?)