Having or showing a fashionable, elegant, or attractive style in appearance or manner.
Stylish comes from 'style' (from Latin 'stilus' meaning a writing instrument, then extended to manner of expression) plus the suffix '-ish'. It became common in the 1800s as fashion terminology.
What's stylish changes constantly—clothes from 20 years ago look dated now—but the word 'stylish' itself proves that humans have always cared about looking cool, going back to ancient Rome where they had style-conscious fashion too!
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