adjective

giving out or reflecting much light; shining.

the sun was dazzlingly bright

shining,light,brilliant,vivid,blazing,dazzling,beaming,intense,glaring,sparkling,flashing,glittering,scintillating,gleaming,glowing,aglow,twinkling,flickering,glistening,shimmering,illuminated,lit,lighted,ablaze,luminous,luminescent,radiant,incandescent,phosphorescent,fluorescent,shiny,lustrous,glossy,sheeny,polished,varnished,irradiant,lucent,effulgent,refulgent,fulgent,lucid,glistering,coruscating,lambent,fulgurant,fulgurating,fulgurous