Full of glare; bright and harsh to the eyes; glaring.
From 'glare' + '-ous' (full of, having qualities of). This older English adjective competes with 'glaring' to describe uncomfortable brightness.
Words like 'glareous' sound archaic today because '-ous' adjectives feel old-fashioned compared to '-ing' forms—so we say 'glaring light' instead of 'glareous light,' showing how English preferences shift over centuries.
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