他说话时不停用手指敲桌子的动作是个独特的习惯性动作。

His constant finger-tapping on the table while speaking is a distinctive ___mannerism.

这位作家的后期作品充满了矫揉造作的风格，失去了早期的自然魅力。

The writer's later works were full of artificial ___mannerism, losing the natural charm of his earlier style.