可爱 (kě'ài) is the everyday word for 'cute, adorable, lovely' — used in speech for people, animals, and things. Unlike 亲爱 (qīn'ài), a term of address like 'dear', or 心爱 (xīn'ài) 'treasured, beloved', it focuses on being endearing to look at or act. 乖巧 (guāiqiǎo) adds the idea of well-behaved, for children or pets.