The Collaborative International Dictionary of English v.0.48:

Glaring \Glar"ing\, a.
   Clear; notorious; open and bold; barefaced; as, a glaring
   crime. -- Glar"ing*ly, adv.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Glare \Glare\ (gl[^a]r), v. i. [imp. & p. p. Glared; p. pr. &
   vb. n. Glaring.] [OE. glaren, gloren; cf. AS. gl[ae]r
   amber, LG. glaren to glow or burn like coals, D. gloren to
   glimmer; prob. akin to E. glass.]
   [1913 Webster]
   1. To shine with a bright, dazzling light.
      [1913 Webster]

            The cavern glares with new-admitted light. --Dryden.
      [1913 Webster]

   2. To look with fierce, piercing eyes; to stare earnestly,
      angrily, or fiercely.
      [1913 Webster]

            And eye that scorcheth all it glares upon. --Byron.
      [1913 Webster]

   3. To be bright and intense, as certain colors; to be
      ostentatiously splendid or gay.
      [1913 Webster]

            She glares in balls, front boxes, and the ring.
                                                  --Pope.
      [1913 Webster]

WordNet (r) 3.0 (2006):

glaring
    adj 1: shining intensely; "the blazing sun"; "blinding
           headlights"; "dazzling snow"; "fulgent patterns of
           sunlight"; "the glaring sun" [syn: blazing, blinding,
           dazzling, fulgent, glaring, glary]
    2: conspicuously and outrageously bad or reprehensible; "a
       crying shame"; "an egregious lie"; "flagrant violation of
       human rights"; "a glaring error"; "gross ineptitude"; "gross
       injustice"; "rank treachery" [syn: crying(a), egregious,
       flagrant, glaring, gross, rank]

Moby Thesaurus II by Grady Ward, 1.0:

139 Moby Thesaurus words for "glaring":
   absolute, arrant, atrocious, bedazzling, blatant, blazing,
   blinding, bold, brazen, brazenfaced, bright, bright and shining,
   brilliant, capital, cheap, chintzy, classical, clean-cut, clear,
   clear as crystal, clear-cut, coarse, colorful, complete,
   conspicuous, consummate, crass, crude, crystal-clear, dazzling,
   decided, defined, definite, definitive, disgraceful, distinct,
   downright, effulgent, egregious, evident, excessive, extravagant,
   extreme, flagitious, flagrant, flamboyant, flaming, flaring,
   flashy, flaunting, fulgent, fulgid, garish, gaudy, glary, gorgeous,
   gross, hanging out, harsh, heinous, in focus, in relief,
   in the foreground, inordinate, intolerable, loud, lurid, manifest,
   meretricious, notable, noticeable, notorious, obtrusive, obvious,
   ostensible, out-and-out, outrageous, outright, outstanding,
   overbright, overt, patent, perfect, plain, positive, precious,
   profound, prominent, pronounced, proper, rank, raw, refulgent,
   regular, resplendent, salient, scandalous, screaming, sensational,
   shameless, shattering, shocking, shrieking, spectacular, splendent,
   splendid, splendorous, staring, stark, stark-staring, sticking out,
   striking, strong, superlative, surpassing, tawdry, the veriest,
   thorough, thoroughgoing, tinsel, total, unbearable, unconcealed,
   unconscionable, undeniable, unequivocal, unmistakable, unmitigated,
   unqualified, unrelieved, unspoiled, utter, visible, vivid, vulgar,
   well-defined, well-marked, well-pronounced, well-resolved