SHINIEST
SHINY
glistening, glossy, lustrous, sheeny, shiny, shining
(adjective) reflecting light; “glistening bodies of swimmers”; “the horse’s glossy coat”; “lustrous auburn hair”; “saw the moon like a shiny dime on a deep blue velvet carpet”; “shining white enamel”
glazed, shiny
(adjective) having a shiny surface or coating; “glazed fabrics”; “glazed doughnuts”
bright, burnished, lustrous, shining, shiny
(adjective) made smooth and bright by or as if by rubbing; reflecting a sheen or glow; “bright silver candlesticks”; “a burnished brass knocker”; “she brushed her hair until it fell in lustrous auburn waves”; “rows of shining glasses”; “shiny black patents”
Source: WordNet® 3.1
Adjective
shiniest
superlative form of shiny: most shiny
Source: Wiktionary
SHINY
Shin"y, a. [Compar. Shinier; superl. Shiniest.]
Definition: Bright; luminous; clear; unclouded.
Like distant thunder on a shiny day. Dryden.
Source: Webster’s Unabridged Dictionary 1913 Edition