Describes something that is not immediately obvious.
Su mirada sotil era capaz de disimular cualquier intención oculta, lo que la hacía aún más intrigante.
Her sly gaze could disguise any hidden intention, making her even more intriguing.
Su comportamiento sotil le permitió engañar a todos en la reunión sin que nadie lo notara.
His subtle behavior allowed him to deceive everyone at the meeting without anyone noticing.