also: コケッティシュ
na-adjective
Describes a woman or her behavior as playfully charming and flirtatious, often with a stylish, slightly provocative air. Borrowed from French 'coquette'.
彼女のコケティッシュな笑顔に、みんな惹きつけられた。
Everyone was captivated by her coquettish smile.
そのドレスはとてもコケティッシュで、彼女によく似合っている。
That dress is very coquettish and suits her well.
Borrowed from French 'coquette', meaning a flirtatious woman, via the adjectival form 'coquettish'. The katakana spelling reflects the French pronunciation.