late 14c., "staring fiercely," present-participle adjective from glare (v.). From 1510s of colors, etc., "vivid, dazzling;" meaning "obtrusively conspicuous" is from 1706. Related: Glaringly.
Entries linking to glaring
glare v.
late 13c., "to shine brightly," from or related to Middle Dutch, Middle Low German glaren "to gleam," from Proto-Germanic *glaz-, from PIE root *ghel- (2) "to shine." Sense of "stare fiercely" is from late 14c. Related: Glared; glaring.