What is the name of calligraphy that is regarded as bold and unconstrained?

This kind of calligraphy is called cursive and running script.

Compared with regular script, cursive script and running script are characterized by smooth lines, bold fonts, and stress on the consistency and expressiveness of strokes, which often give people a feeling of unrestrained.

The main characteristics of this calligraphy style are smooth lines, bold fonts, emphasis on the coherence and expressiveness of strokes, and a sense of boldness and boldness.

Cursive script and running script are derivatives of regular script. Compared with regular script, cursive script and running script pursue the artistic effect of freehand brushwork, and are often used in calligraphy creation, artistic expression and personal calligraphy style display.