free form

US /ˈfriː fɔːrm/
UK /ˈfriː fɔːrm/
"free form" picture
1.

自由形式的, 不受约束的

not restricted by rules or conventions; unconstrained

:
The artist used a free-form style in her painting.
这位艺术家在她的画作中采用了自由形式的风格。
They had a free-form discussion with no set agenda.
他们进行了一场没有固定议程的自由形式讨论。