Comparative form of pretty: more pretty(adjective)
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Use "prettier" in a sentence
""Through research I've also discovered that 46% of 16-year-old teenage girls would consider plastic surgery to make themselves what they call prettier or thinner.""
"I've noticed a few women friends starting to dress very prettily and femininely, wearing more skirts and makeup in prettier (less drab) colors."
"It looks like an anachronism in Chicago's magnificent skyline, and it's no prettier from the street next to it either."