From The Collaborative International Dictionary of English v.0.48:
Garish \Gar"ish\ (g[^a]r"[i^]sh), a. [Cf. OE. gauren to stare; of uncertain origin. Cf. gairish.] 1. Showy; dazzling; ostentatious; attracting or exciting attention. "The garish sun." "A garish flag." --Shak. "In . . . garish colors." --Asham. "The garish day." --J. H. Newman. [1913 Webster]
Garish like the laughters of drunkenness. --Jer. Taylor. [1913 Webster]
2. Gay to extravagance; flighty. [1913 Webster]
It makes the mind loose and garish. --South. -- Gar"ish*ly, adv. -- Gar"ish*ness, n. --Jer. Taylor. [1913 Webster]