Wide and profound
Used to indicate that one's studies, published works, or thinking is extensive
Positive
中国民乐博大精深,历史悠久,尤其笛子艺术 | Zhōngguó mínyuè bódàjīngshēn, lìshǐ yōujiǔ, yóuqí dízi yìshù
Chinese folk music is rich and profound, and its history is long, especially that of the flute
[Source]
软件工程与项目管理是成熟而博大精深的学科 | Ruǎnjiàn gōngchéng yǔ xiàngmù guǎnlǐ shì chéngshú ér bódàjīngshēn de xuékē
Software development and project management are mature and profound disciplines
[Source]
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This is an HSK chengyu
《〈逸周书〉序》(Yì Zhōu Shū Xù), a work by Míng Dynasty (Míng, 1368 - 1644) author 姜世昌 (Jiāng Shì Chāng)
This chengyu is from a line in the work listed in the "Origin" section above