perceptively russian

• то́нко

  thinly, in thin slices

  finely, delicately, elegantly

  subtly, perceptively, astutely

• проницательно

  perceptively, keenly, shrewdly, sagaciously

Examples

• Она проницательно посмотрела на него и всё поняла.

  She looked at him perceptively and understood everything.

• Учитель проницательно заметил ошибку в рассуждении ученика.

  The teacher perceptively spotted an error in the student's reasoning.