enigmatic smile/expression etc• She smiled that enigmatic smile again as I countered with my bishop's pawn.• His sometimesenigmatic expression and behaviour were likened to that of the sphinx in cartoonists' caricatures.• He didn't say anything, he just smiled his quiet, enigmatic smile and returned to his paper.• His face wore that same enigmatic smile, but he did not speak.• Rafiq did not speak but stood looking at his two colleagues, an enigmatic smile on his face.