/slaɪ ||; slaɪ/adj1 (used about a person) acting or done in a secret or dishonest way, often intending to trick people （指人）狡诈的，阴险的 [SYN] cunning 同义词为cunning
2 (used about an action) suggesting that you know sth secret （指动作）会意的，心照不宣的:
a sly smile/look 会意的微笑╱神色 ➔slyly adv