She smiled without speaking, mysterious and inscrutable.
Tips
history
咲 is an archaic variant of 笑 (xiào), meaning to laugh or smile. It is found in classical Chinese texts and is no longer used in modern standard Chinese. In Japanese, 咲 (saku) means 'to bloom (of flowers)' — a completely different meaning.
usage
In modern Chinese, 咲 is essentially obsolete. You may encounter it in classical literature or as a given name. Always use 笑 in contemporary writing.
