Treated with a wet-look gel and combed straight back(adjective)
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Use "slicked-back" in a sentence
"Still painfully shy, he nevertheless stood out because of his appearance -- including long sideburns, slicked-back hair and funky clothes."
"Something about Casey's slicked-back hair was odd."
"Despite his slicked-back orange hair, his polished briefcase, and his immaculate complexion, he seemed more suited for raiding costal villages and carrying off young maidens than as the representative of the most famous law firm on the planet."