Scarlet (adjective)

1. Of a bright red colour, tinged with orange.
2. Immoral, licentious, scandalous.

Origin:

From middle english scarlat, scarlet, from old french escarlate, from late latin scarlata, from persian سقرلات‎ (soghrulât), from arabic سُقْرُلَات‎ (suqrulāt), the feminine form of arabic سُقْرِيٌّ‎ (suqriyy, “reddish”), from سَقَرَ‎ (saqara, “to be red”), from proto-semitic *śaqr-. compare saqirlat, a kind of fine woolen cloth, so called from its scarlet color.

Examples:

1. She wore a scarlet dress to the party.
2. The scarlet letter was a symbol of shame in Puritan society.
3. The tabloids published scandalous stories about the celebrity's scarlet past.