IPA: /ˈsɛksiər/
KK: /ˈsɛksiər/
More attractive or appealing in a sexual way than someone or something else.
She wore a dress that made her look sexier than ever.
Sexier → It is formed from "sex" (from Latin "sexus", meaning gender or sex) and the comparative suffix "-ier" (indicating more). The word "sexier" means more sexually attractive or appealing.
Think of the word 'sex' which relates to gender or attraction, and remember that 'sexier' means more attractive in that context.