sexy /ˈsɛksi/adjective 4forms 2phrases 1 adjective4 •physically attractive, in a way that makes others feel desireThe participants in the swimsuit competition are all very sexy.She has a sexy voice! •(informal) Intriguing, appealing, likely to excite interest.The manufacturers have launched a sexy new car.We have some sexy ideas on how to improve sales. •(informal, rare) Sexual; relating to or involving sex.He didn't really like me; all he wanted was for me to be sexy with him. •Used to describe prime numbers that differ from each other by six.(73,79) is a sexy prime pair. formssexier · sexiest Phrases with sexy sexy upTo make more sexually attractive.