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1. of a brilliant red color:

深紅色の, 緋色（ひいろ）の〘明るいオレンジに近い赤色〙

e.g. a mass of scarlet berries.

2. chiefly dated (of an offense or sin) wicked; heinous.

immoral, especially promiscuous or unchaste.

〈女性が〉ふしだらな

a brilliant red color:

深紅色, 緋色

e.g. papers lettered in scarlet and black.

scarlet clothes or material.

緋色の服

Middle English (originally denoting any brightly colored cloth): shortening of Old French escarlate, from medieval Latin scarlata, via Arabic and medieval Greek from late Latin sigillatus ‘decorated with small images’, from sigillum ‘small image’.