superlative adjective: sexiest
sexually attractive or exciting.
"sexy French underwear"
synonyms: sexually attractive, seductive, desirable, alluring, toothsome, sensual, sultry, slinky, provocative, tempting, tantalizing; nubile, voluptuous, luscious, lush, hot, beddable, foxy, cute; INFORMAL bootylicious
"neither of them was feeling sexy"
synonyms: (sexually) aroused, sexually excited, amorous, lustful, passionate; INFORMAL horny, hot, turned on, sexed up
"I've climbed most of the really sexy west coast mountains"
synonyms: exciting, stimulating, interesting, appealing, intriguing, slick, red-hot
"a sexy sales promotion"