sly

sly /sl'aɪ/
1 [ADJ] usu ADJ n
A sly look, expression, or remark shows that you know something that other people do not know or that was meant to be a secret.
His lips were spread in a sly smile...
slyly [ADV]
Anna grinned slyly.
2 [ADJ]
If you describe someone as sly, you disapprove of them because they keep their feelings or intentions hidden and are clever at deceiving people.
She is devious and sly and manipulative...
= cunning

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