sly

sonrisa taimada

a smile that suggests you are being secretive or mischievous

una sonrisa que sugiere que estás siendo reservado o travieso

sonrisa pícara

a smile that shows you know a secret

una sonrisa que muestra que conoces un secreto

mirada furtiva

a glance that is cunning or secretive

una mirada que es astuta o secreta

guiño pícaro

a wink that suggests a shared secret or joke

a subtle, critical remark made in a clever way

humor socarrón

a type of humor that is subtle and clever

un tipo de humor que es sutil e inteligente

ingenio astuto

the ability to say clever and amusing things