Vigorous meaning: (shape) old and straight. It is often used to describe trees, paintings and calligraphy.
The source of vitality and vigor: Liu Yuanbiao's "General Theory of Hermitage and Neo-Confucianism III": "The noble spirit is deeper than Confucian classics, and its spirit is beyond the reach of shallow learning."
A powerful example
1, after the baptism of wind and rain, the mountain pine looks more vigorous and tall.
The old calligrapher's works are vigorous and upright.
His calligraphy is vigorous.
His handwriting is vigorous and powerful, and his style is extraordinary.
His calligraphy is vigorous and powerful.
6. This calligraphy is vigorous and powerful.